Sideshow Bob

Sideshow Bob
The Simpsons character
First appearance	"The Telltale Head" (1990)
Designed by	Brad Bird
Voiced by	Kelsey Grammer
In-universe information
Full name	Robert Underdunk Terwilliger Jr.
Occupation	Former television personality Former mayor Criminal
Family	Dr. Robert Terwilliger Sr. (father) Dame Judith Underdunk (mother) Cecil Terwilliger (brother)
Spouses	Selma Bouvier (ex-wife) Francesca (ex-wife) Tasha (wife)
Children	Gino

Dr. Robert Underdunk "Bob" Terwilliger Jr., PhD, better known as Sideshow Bob, is a recurring antagonist in the animated television series The Simpsons. He is voiced by Kelsey Grammer and first appeared in the episode "The Telltale Head". A self-proclaimed genius and graduate of Yale University, Bob champions high culture and speaks with a transatlantic accent similar to the one Grammer uses as Dr. Frasier Crane in the sitcoms Cheers and Frasier. He began his career as a sidekick on Krusty the Clown's television show, but after enduring constant abuse, Bob framed his employer for armed robbery in "Krusty Gets Busted", only to be foiled by Bart Simpson and sent to prison. While imprisoned, Bob began seeking revenge against Bart, and the two became archenemies.

Bob's second major appearance came in season three's "Black Widower"; the writers echoed the premise of Wile E. Coyote chasing the Road Runner by bringing Bob back into Bart's life with another murderous scheme. Thereafter, Bob serves as the series' recurring evil genius, repeatedly emerging from prison with elaborate revenge schemes that Bart and Lisa usually foil. Bart remains his principal target, although his schemes also threaten Krusty and extend to the entire Simpson family in season 17. The Halloween story "Wanted: Dead, Then Alive", the first segment of "Treehouse of Horror XXVI" (season 27), imagines Bob finally killing Bart. Before the murder, he remarks that he has spent 24 years trying to kill a ten-year-old child; with Bart dead, he soon becomes bored and brings him back to life so that he can kill him repeatedly.

Sideshow Bob shares traits with Grammer's Crane and has been described as "Frasier pickled in arsenic." The resemblance extends to the casting: David Hyde Pierce and John Mahoney played Bob's brother Cecil and his father, respectively, echoing their roles in Frasier. Grammer, who based Bob's voice on that of actor Ellis Rabb, has been praised for his portrayal of Bob. In 2006, Grammer won a Primetime Emmy Award for voicing Sideshow Bob.

As of season 36, Sideshow Bob has appeared in more than 40 episodes, with speaking roles in 25 and 15 episodes centered on him. The latest episode centered on Bob, "Treehouse of Horror XXXIV", aired during the 35th season; his latest speaking appearance in the series was in "The Yellow Lotus" in the 36th season. Other episodes refer to Bob without featuring him, and his role goes beyond television into other Simpsons media. He appears in the Simpsons Comics and the 2007 video game The Simpsons Game; he also stars as the main antagonist in The Simpsons Ride at Universal Studios' theme parks. A lover of Gilbert and Sullivan operettas, Sideshow Bob is also known for his singing voice; several of Grammer's performances have been included in The Simpsons musical compilations.

Appearances

On The Simpsons

Sideshow Bob first appears in "The Telltale Head" (season 1, 1990) as a non-speaking sidekick who communicates only through a slide whistle on Krusty the Clown's television show. After the head is stolen from Jebediah Springfield's statue, Krusty encourages his viewers to identify the thief. Bob joins the town mob after the townspeople discover that Bart Simpson took it. After Krusty subjects Bob to repeated abuse, including shooting him from a cannon and pelting him with pies, the Yale-educated Bob grows angry with his employer and resentful of the clown's success. In "Krusty Gets Busted" (season 1, 1990), Bob turns on Krusty, disguising himself as the clown and framing him for armed robbery of the Kwik-E-Mart. After Krusty is arrested, Bob takes control of the show, introducing children to elements of high culture. However, Bob's reign is short-lived; Bart exposes him as the robber, Krusty is released, and Bob is fired and sent to jail.

In "Black Widower" (season 3, 1992), Bob, prisoner number 24601, is released from prison. He marries Bart's aunt Selma Bouvier as part of a scheme to inherit money she has invested in the stock market. Bob attempts to blow Selma up during their honeymoon, but Bart again foils the plan, and Sideshow Bob returns to prison.

Bob after performing H.M.S. Pinafore in "Cape Feare" (1993). Before singing, he tells Bart: "I shall send you to heaven before I send you to hell."

In "Cape Feare" (season 5, 1993), Bob targets Bart himself for the first time. After being paroled, he threatens Bart repeatedly and forces the Simpsons into hiding as part of the Witness Relocation Program. Bob follows them to their hideout, a houseboat on Terror Lake, and, after subduing the family, prepares to kill Bart. Bob grants Bart one final request, and Bart asks to hear him sing the entire score of H.M.S. Pinafore. Bob finishes singing and nearly kills Bart, but the delay allows the houseboat to drift back to Springfield, where police arrest him for the third time.

In "Sideshow Bob Roberts" (season 6, 1994), Bob is released again and runs for mayor of Springfield as the populist Republican Party candidate (having previously identified himself as "a lifelong Republican" in "Black Widower"). He defeats Democratic Party incumbent Joe Quimby in a landslide, but Bart and Lisa learn from Waylon Smithers that Bob rigged the election by using the names of deceased people. At trial, Bob claims innocence, but Bart and Lisa trick him into revealing his guilt, sending him back to prison. In "Sideshow Bob's Last Gleaming" (season 7, 1995), Bob escapes from prison for the first time and threatens to blow up Springfield with a nuclear bomb unless the city stops broadcasting all television shows. When the bomb proves to be a dud, Bob kidnaps Bart and takes to the air in the Wright brothers' plane, intending to kill himself, Bart, and Krusty. Krusty, Bob's intended target, is hiding inside a shack, improvising a performance on the Emergency Broadcast System. That attempt also fails, and Bob returns to prison.

Bob appears to have reformed and helps Bart and Lisa in "Brother from Another Series" (season 8, 1997). Reverend Lovejoy declares him a changed man and recommends him for the prison's work release program. Bob is released into the care of his younger brother Cecil, now Springfield's chief hydrological and hydrodynamical engineer. The episode traces Cecil's resentment to an audition ten years earlier, when Krusty passed him over and instead chose Bob as the perfect comic foil. Seeking to frame his brother, Cecil sabotages the Springfield Dam in an attempt to flood the town. Bob, Bart, and Lisa stop Cecil and save the town, but both brothers are sent to prison despite Bob's innocence.

In "Day of the Jackanapes" (season 12, 2001), Bob sets his sights on Krusty again. While in prison, he learns that Krusty has erased all the early shows featuring Sideshow Bob. Krusty, annoyed with the network executives, is announcing his fifth and final retirement. Bob is released from prison and develops a plot to kill Krusty using Bart as a suicide bomber during Krusty's retirement special. Just as Bob is about to kill Bart and Krusty, he hears Krusty publicly accept responsibility for turning him into a criminal and express regret for mistreating him as a sidekick. Krusty's conciliatory song disarms Bob, who abandons the murder plot and reconciles with his former employer, though his part in the scheme still sends him back to prison. Bob again helps the Simpsons in "The Great Louse Detective" (season 14, 2002), when Springfield police release him from prison to investigate an attempt on Homer Simpson's life. During the adventure, Bob is advised to kill Bart without hesitation rather than allow himself to be tricked into delaying or otherwise bungling his plans. After the culprit is revealed to be Frank Grimes's son, Bob again turns his attention to murdering Bart. However, Bob finds he is "accustomed to his [Bart's] face" and cannot do it.

By "The Italian Bob" (season 17, 2005), Bob has fashioned a new life in Italy. He is now mayor of the Tuscan village of Salsiccia, husband to Francesca, and father to Gino. The Simpson family, in Italy to retrieve a car for Mr. Burns, encounters him by chance. Bob welcomes them on the condition that they not reveal his criminal past; a drunken Lisa nevertheless jokes about Bob's crimes and reveals his prison uniform, turning the villagers against him. Bob then resolves to kill the entire Simpson family rather than Bart alone. When Francesca and Gino catch up with Bob, they join his vendetta. Bob's father, Robert Terwilliger Sr., and mother, Dame Judith Underdunk, join the vendetta in "Funeral for a Fiend" (season 19, 2007), their first appearance in the series. Cecil also joins the plot in his second appearance. Bob initially attempts to kill the Simpson family again, but his plan fails. Having staged his own death during his trial, Bob locks Bart in the coffin and attempts to cremate him at the otherwise empty funeral home, to the maniacal laughter of the assembled Terwilligers. Lisa and the rest of the Simpson family foil the plot, and the Terwilligers are sent to prison.

In "Sex, Pies and Idiot Scrapes" (season 20, 2008), Bob is listed among the criminals sought by Homer and Ned Flanders as bounty hunters, although he is still in prison; he escapes at the end of the episode. In "Wedding for Disaster" (season 20, 2009), a keychain bearing the initials 'S' and 'B' leads Bart and Lisa to suspect that Bob has kidnapped Homer to prevent him from attending his second wedding to Marge. Krusty, however, confirms that Bob was with him all day. Eventually, Bob and the kids discover the true culprits, Patty and Selma. Bob also appears in a visual joke in "Coming to Homerica", the 21st episode of the season: the Simpson family enters the Cheers bar dressed as the show's cast, followed by Sideshow Bob dressed as Frasier Crane. In "O Brother, Where Bart Thou?" (season 21, 2009), Bob makes a silent cameo in Bart's dream sequence as Bart longs for a younger brother. Cecil makes his third appearance in The Simpsons, flying kites with Bob.

Later that season, Bob resumes his attempts to kill Bart in "The Bob Next Door". He switches faces with his prison cellmate Walt Warren. Bob returns to Springfield and moves into the house next to the Simpson family, assuming Walt's identity. He plans to use multiple state lines to evade prosecution for killing Bart, but he is foiled again and taken away by state police. Bob next appears in "At Long Last Leave" (season 23, 2012), the 500th episode of The Simpsons. He attends a town meeting to decide if the Simpson family should be banished from Springfield and joins many residents in supporting the proposal. He makes a silent appearance in "Moonshine River" (season 24, 2012), where he runs across the train tracks trying to kill Bart and is struck by a train.

Bob's genetically modified jaw in "The Man Who Grew Too Much" (2014). The A.V. Club described the transformation as "unimaginatively lazy".

In "The Man Who Grew Too Much" (season 25, 2014), Bob has become chief scientist at Monsarno, a genetic engineering company, after serving as a test subject and publishing the results of experiments performed on him. He and Lisa bond over their interest in Walt Whitman, but Bob reveals that he has modified his own genes to acquire several superhuman abilities. He plans to use DNA from historical figures' relics in the Springfield Museum to transform himself into a superhuman dictator. After a family repeatedly asks him to retake its photograph, Bob chases down Bart and Lisa in a murderous rage. Before he can kill them, teenagers from Marge's abstinence class attack him. Lisa quotes Whitman during the fight; Bob realizes that he has become a crude monster and jumps off the Springfield Dam. The final shot reveals Bob alive underwater, breathing through the gills he engineered. The A.V. Club found the experimentation too cartoonish even for The Simpsons, while TV Fanatic called the transformation "silly even for him".

Bob is back in prison in "Clown in the Dumps" (season 26, 2014). He offers his condolences to Krusty following the death of Krusty's father, Rabbi Krustofsky. Several episodes later, in "Blazed and Confused" (season 26, 2014), Bob meets Bart's former teacher Mr. Lassen. Now a prison guard after losing his teaching job through Bart's actions at a "Blazing Guy" festival, Lassen offers to free Bob if they team up and take turns gutting Bart. Bob declines.

The Halloween story "Wanted: Dead, Then Alive", the first segment of "Treehouse of Horror XXVI" (season 27, 2015), imagines Bob using Milhouse's phone to trap Bart in the band classroom and finally killing him. His revenge accomplished, Bob turns to other ambitions, only to find his life meaningless without Bart. He creates a machine that repeatedly brings Bart back to life so that he can kill him again. The other Simpsons eventually find Bob and rescue Bart, who uses the machine to turn Bob into a twisted amalgamation of creatures.

Several brief appearances follow in seasons 27 and 28. In "Gal of Constant Sorrow" (season 27, 2016), Bob joins Snake Jailbird and other inmates in wiping Bart's graffiti from Hettie Mae Boggs' promotional poster and grunting in annoyance. Bob returns in "Treehouse of Horror XXVII" (season 28, 2016), the 600th episode of The Simpsons. In the opening sequence, he appoints himself leader of a four-member group of Homer's enemies that includes the ghost of Frank Grimes. Seeking revenge, the group attempts to kill the Simpsons, but Maggie kills every member except Grimes's ghost. In the ending sequence, Bob is one of the characters featured in the "600" song played by Judith Owen. In "Havana Wild Weekend" (season 28, 2016), Sideshow Bob appears in the background during the airport check-in scene in Cuba. Bob also makes a silent cameo in "The Nightmare After Krustmas" (season 28, 2016); as Krusty nearly drowns in a frozen lake, Bob stands among the crowd holding a sign that reads "Die Clown".

In "Gone Boy" (season 29, 2017), Bob tries to locate Bart after he goes missing and is presumed dead. When Bob finds Bart, he prepares to kill him and Milhouse, but saves them at the last minute after recalling the prison therapist's lessons about moving on from his desire to kill Bart. The epilogue shows an older Bob, now known as Elder Bob, working as a lighthouse keeper and still regretting that he did not kill Bart. In "The Fat Blue Line" (season 31, 2019), Bob escapes from prison once again, only to be hit by a rake truck. Several episodes later, in "Bobby, It's Cold Outside" (season 31, 2019), he is hired to play Santa Claus at a theme park and later helps the Simpsons discover who is stealing everyone's Christmas gifts.

Bob has three brief appearances across seasons 32 and 33. In "I, Carumbus" (season 32, 2020), he is a Roman gladiator and is sliced in half by Obeseus (Homer). Later that season, in "Manger Things" (season 32, 2021), a Christmas card shows him holding a wrapped-up Bart beneath the text "Just what you've always wanted". Bob makes another silent cameo in "Meat Is Murder" (season 33, 2022), where he signs the chests of residents, including Kirk Van Houten, during the celebration of Krusty Burger's 50th anniversary—a callback to the "Die Bart, Die" scene from "Cape Feare".

The "Treehouse of Horror XXXIV" segment "Ei8ht" (season 35, 2023) imagines an alternative ending to "Cape Feare" in which Bob realizes that Bart is using Pinafore to delay his death. Bob kills him, traumatizing Lisa. Thirty years later, Professor Lisa Simpson seeks help from the imprisoned Bob after Springfield police ask her to investigate a series of murders by an unknown serial killer. He only mocks her, and Lisa later realizes that she committed all the murders herself. Bob is transferred to another prison cell and finds Lisa waiting for him. Lisa reveals that a split personality emerged after Bart's death and that she committed the murders in hopes of being imprisoned alongside Bob. To the music of H.M.S. Pinafore, Lisa gleefully slashes Bob to death.

In the season 36 episode "The Yellow Lotus", Bob appears in a supporting role as a married guest at the same resort as the Simpsons. He also mentions that he has been diagnosed as a sociopath "with a slight touch of the narcissist" and is taking medication. When Marge tells Bob's wife about his past crimes, Bob's wife throws him off a cliff. He survives and later talks with Sideshow Mel.

Other media

Sideshow Bob depicted escaping from Springfield Penitentiary at Universal Studios Hollywood (2022).

Outside the television series, Bob appears with Disney villains in the 2024 Disney+ animated short film The Most Wonderful Time of the Year. Kelsey Grammer recorded several Sideshow Bob lines for a scene ultimately cut from The Simpsons Movie. In the deleted scene, Bob joins an angry mob intent on killing Bart, then leaves in disappointment after learning that it is apparently targeting only Homer. Sideshow Bob has also appeared in Simpsons Comics.

Several of Kelsey Grammer's singing performances have been included in The Simpsons CD compilations. His performance of H.M.S. Pinafore in "Cape Feare" later appeared on the album Go Simpsonic with The Simpsons, and the song "The Very Reason That I Live" from "The Great Louse Detective" appeared on The Simpsons: Testify. A previously unaired song, "Hullaba Lula", originally written for "Day of the Jackanapes", also appeared on The Simpsons: Testify. The producers modeled the song after "Zip-a-Dee-Doo-Dah", but removed it from the episode after failing to secure the necessary rights.

Sideshow Bob appears in the 1991 The Simpsons Arcade Game, where he is one of the Springfield characters who walk past the players. Bob is also named among the antagonists in the 1991 video game Bart vs. the Space Mutants. In The Simpsons Game, released in November 2007, Bob has a cameo appearance. Bob has a larger role in The Simpsons Ride, which opened at Universal Studios Florida and Universal Studios Hollywood in May 2008. Voiced by Grammer, he is the main villain in the ride, having escaped from prison to get revenge on the Simpson family.

In The Simpsons: Tapped Out, a city-building game released in February 2012, Sideshow Bob appears as a bonus character. Bob pops up every so often, giving players a chance to tap on him to receive a small sum of money and "send" him to jail. In a later update to the game, Sideshow Bob also has a stand in Krustyland, where players get to pop balloons for a chance to win donuts and Krusty tickets. The Terwilligers content update for The Simpsons: Tapped Out was released on April 14, 2015, and contained several references to episodes of The Simpsons featuring Sideshow Bob. The event was split into three acts and ended May 26, 2015. New characters, skins, and costumes included Sideshow Bob, Cecil Terwilliger, Gino Terwilliger, Francesca Terwilliger, Dr. Robert Terwilliger Sr., Dame Judith Underdunk, Captain Bob, and Opera Krusty. Most of the event action took place at Monsarno Research and Outdoor Opera Stage.

Character

Creation

Sideshow Bob in his first appearance in "The Telltale Head", with the rounded hairstyle used before his redesign for "Krusty Gets Busted"

Sideshow Bob first appeared in "The Telltale Head", the eighth episode of season 1. His original design was simpler than later versions and featured a rounded hairstyle. Toward the end of the episode, however, he reappears in a panning shot of a crowd with his now-familiar newer hairstyle. His second appearance—and his first major one—came in season 1's twelfth episode, "Krusty Gets Busted", written by Jay Kogen and Wallace Wolodarsky. Bob's design was updated for "Krusty Gets Busted"; as the episode's animation style evolved, director Brad Bird made Bob sleeker to fit Grammer's vocal performance. Following the redesign, animators tried to redraw his scenes in "The Telltale Head" but lacked time before production ended. Director David Silverman also updated the character model for "Black Widower" to reflect Brad Bird's animation style. Bird particularly enjoyed animating Bob and Krusty, whom he found "really absurd and strangely real". He asked to provide key drawings for selected scenes in their episodes.

Bob does not speak during the first half of "Krusty Gets Busted"; he communicates only through a slide whistle. The whistle was intended to make him seem simplistic so that his sophisticated vocabulary would surprise viewers when he finally spoke. An early version of the script for "Krusty Gets Busted" called for James Earl Jones to voice Bob, but the producers instead selected Kelsey Grammer. Grammer was then playing Frasier Crane on Cheers, where Simpsons co-developer Sam Simon had heard him sing. Simon advocated casting him as Bob. According to Grammer, Simon telephoned to ask him to sing Cole Porter's "Ev'ry Time We Say Goodbye", explaining, "we want him [Sideshow Bob] to speak finally".

For Bob's voice, Grammer performed an impression of theater actor and director Ellis Rabb. Grammer had once worked for Rabb, whose "lamenting tones became [the] foundation for Sideshow Bob". His work included painting Rabb's apartment and hanging wallpaper; he listened to the actor's stories. He recalled thinking, "I'm gonna use him someday". Bob's taste for Cole Porter in the script reminded Grammer of Rabb.

Sideshow Bob's full name is Robert Underdunk Terwilliger Jr., PhD. His surname is revealed in "Black Widower", and his middle name in "Sideshow Bob Roberts". In 2024, Bill Oakley said that he and Josh Weinstein had written the middle name as "Onderdonk", rather than "Underdunk". He traced it to Henry Onderdonk, whose name they had found in a hymnal at high school. Larry Carroll of MTV Movie News reported that Bob's surname came from Dr. Terwilliker, a megalomaniacal piano teacher in the film The 5,000 Fingers of Dr. T., co-written by Dr. Seuss. The Oregonian has also associated the name with Southwest Terwilliger Boulevard in Portland, Oregon.

Development

For season three's "Black Widower", the writers echoed the premise of Wile E. Coyote chasing the Road Runner from Looney Tunes cartoons by having Bob unexpectedly reenter Bart's life through his marriage to Selma, whom he plans to murder. Executive producer Al Jean has compared Bob's character to that of Wile E. Coyote, noting that both are intelligent yet always foiled by opponents they perceive as intellectually inferior. Oakley and Weinstein chose a mayoral campaign instead of another murder plot for "Sideshow Bob Roberts" (1994). Bill Oakley and Josh Weinstein, the showrunners for the seventh and eighth seasons, believed that each season should include a Sideshow Bob episode. By season seven, however, four Bob-centered episodes had already aired, and the writers struggled to find new uses for him. Weinstein described Bob's refined dialogue as difficult to write. Despite the challenge, the staff relished "Sideshow Bob episodes", and former director Dominic Polcino described them as "a treat" to work on. In 2014, Jean said he would approve another Bob episode only if the writers found a good new use for him, to avoid overusing the character.

Oakley recalled that the writers expected Bob's apparent reform in "Brother from Another Series" (1997) to be temporary: "we figured that would revert back". A rule for earlier episodes featuring Bob called for a recap of his evil deeds; this was dropped after season eight's "Brother from Another Series" when the chronology became too lengthy. The writers also initially required Bob to return to prison at the end of each episode, although they abandoned this pattern in later episodes such as "The Great Louse Detective" and "The Italian Bob". In 2020, Jean said he liked the idea of Bob exiled to a lighthouse, "thinking about the life that he wasted".

For "Treehouse of Horror XXVI" (2015), Jean used the noncanonical Halloween format to let Bob kill Bart without removing him from the regular series. He welcomed the outcome, recalling his childhood wish that the Coyote would catch the Road Runner. The story then explored how Bob would feel after achieving his life's ambition. For "Treehouse of Horror XXXIV" (2023), co-showrunner Brian Kelley said the writers first imagined Bob in an alternate future. Writer Jessica Conrad then proposed storytelling and visuals inspired by David Fincher's films.

Kelsey Grammer modeled Bob's voice on actor and director Ellis Rabb.

Kelsey Grammer initially expected Sideshow Bob to be a one-time role but has called him "the most popular character I've ever played". Grammer usually joins the show's "table readings" (where cast members read each script together for the first time), and former executive producer David Mirkin has described Grammer as very pleasant to work with because of his lively sense of humor. Mirkin says that Grammer is capable of perfect readings but notes that the actor dislikes performing Sideshow Bob's evil laugh. In a 2007 interview, Simpsons executive producer Al Jean listed Grammer as one of his favorite guest stars (second only to Phil Hartman), saying, "His voice is so rich." Writer George Meyer said that writing for Grammer was "great", adding, "He can give the kind of purple, florid, melodramatic speeches that most of the characters would never give. And he can sing."

The show's writers admire Grammer's singing voice and try to include a song for each appearance. Alf Clausen, the primary composer for The Simpsons, commented that "[Grammer] is so great. He's just amazing. You can tell he has this love of musical theater and he has the vocal instrument to go with it, so I know whatever I write is going to be sung the way I've heard it." Clausen composed Sideshow Bob's theme, which first appeared in "Cape Feare" and plays whenever Bob leaves prison or is about to commit a sinister act. It is based on Bernard Herrmann's score for the film Cape Fear. The musical score for "Cape Feare" earned Clausen an Emmy Award nomination for Outstanding Dramatic Underscore – Series in 1994.

In a visual gag, Bob has "LUV" and "HAT" tattooed on his knuckles. The joke parodies the "LOVE" and "HATE" tattoos in The Night of the Hunter, shortening the words to fit his three cartoon fingers. Bob often bears prisoner number 24601, the number assigned to Jean Valjean in Les Misérables. Another of Bob's trademarks is a visual gag in which he steps on a rake and its handle strikes him in the face; the joke first appeared in "Cape Feare". To fill time, the writers added nine iterations of the same joke in quick succession. Known as the "rake joke", the sequence has received praise; Entertainment Weekly described it as "genius in its repetitive stupidity". For the 2024 short "The Most Wonderful Time of the Year", Silverman suggested having Bob dismiss the routine as stale. Jean said he would not use the gag again himself, though other writers could still do so.

Family

David Hyde Pierce voiced Cecil, Bob's brother, who was modeled on Pierce's role as Niles Crane in Frasier.

The episode "Brother from Another Series" introduces Bob's brother Cecil. Assigned to write an episode featuring Sideshow Bob, Ken Keeler drew on Frasier and modeled Cecil on the brother of Grammer's character. Cecil is voiced by David Hyde Pierce, who portrayed Frasier Crane's brother Niles. Many of the interactions between Bob and Cecil were based on those of Niles and Frasier. Pierce commented, "Normally, I would not do something like this. But how often do you get a chance to work with an actor like Kelsey Grammer and, more importantly, play his brother?"

Several of Frasier's producers were asked to review the original script and provide feedback. Their only concern was a brief scene in which Cecil addresses a visible character as "Maris". Because Maris Crane is an unseen character in Frasier, they asked for the scene to be removed. The artists drew Cecil to resemble David Hyde Pierce while retaining a visual similarity to Sideshow Bob. According to director Pete Michels, it was difficult to draw Bob and Cecil standing together because of their comically oversized feet.

Cecil returns in season 19's "Funeral for a Fiend", which introduces the brothers' previously unseen father, Dr. Robert Terwilliger, played by John Mahoney. Mahoney portrayed Martin Crane, the father of Grammer's and Pierce's characters in Frasier. In Frasier, Mahoney's "down-to-earth, average guy" served as a foil to Grammer's and Hyde Pierce's "uppity snobs"; Robert Terwilliger Sr. is as highbrow as Bob. Robert Terwilliger Sr.'s wife, Bob's mother, is Dame Judith Underdunk, "the finest classical actress of her generation." She sports the same curly, spiked hair as her two sons. Bob also has an ex-wife named Francesca (voiced by Maria Grazia Cucinotta) and a son named Gino, both of whom were introduced in the season 17 episode "The Italian Bob" and returned for "Funeral for a Fiend". Cucinotta also voiced Francesca in Italian.

Blake Taylor of /Film wrote that introducing a wife and son gave Bob greater depth while keeping him a villain. Gino shares his father's appearance, manner of speaking, and cruelty, while Francesca joins them in their hostility to the Simpsons. Literary scholar Maria Elisa Montironi reads the father–son resemblance as a parallel with Shakespeare's Coriolanus. She notes that Gino's angry pursuit of a butterfly recalls young Marcius, whose violence is taken as evidence of his father's temperament.

Reception

Nancy Cartwright, the voice of Bart Simpson, praised Grammer's "deliciously vile energy" as Bob.

The character of Sideshow Bob and Grammer's voice work have received many accolades. In 2006, IGN listed him as the second-best "peripheral character" on The Simpsons, commenting that Bob is "a man of contradictions; his goofy appearance, complete with palm tree like hair, doesn't seem to match up to the well spoken and even musically talented maniac." Also that year, Wizard magazine rated Bob as the 66th-greatest villain of all time. Adam Finley of TV Squad praised Bob's baritone voice, Shakespearean delivery, and ability to go from calm to "stark raving mad" within a second, calling him one of the show's best recurring characters.

In a 2020 retrospective, The Independent called Bob "the perfect Simpsons antagonist". It wrote that his vocabulary and love of Gilbert and Sullivan let the show's writers "indulge their artier inclinations", while his villainy was tempered by "vaudevillian buffoonishness". Reviewing "Black Widower", The A.V. Club wrote that Grammer "manages to make a prissy elitist scary" and praised the "musicality" and "poetry" of his performance. A 2014 A.V. Club review likewise found that Grammer could still make Bob "vitally funny and menacing" 24 years after the character's debut.

Kelsey Grammer's voice work has consistently received praise; Sideshow Bob has been described as "brilliant", "inimitable", "stentorian", and "a feast of mid-Atlantic anglophilia". In 2006, Grammer won the Primetime Emmy Award for Outstanding Voice-Over Performance for his recurring role as Sideshow Bob. He had previously won four awards in the Outstanding Lead Actor in a Comedy Series category for his portrayal of the title role on Frasier. In 2007, Grammer was included in Entertainment Weekly's list of the sixteen best Simpsons guest stars; Hyde Pierce was also included in that list. Ken Tucker of Entertainment Weekly wrote that "Kelsey Grammer's grand voice-performance as Sideshow Bob is Frasier pickled in arsenic." In her book My Life as a 10-Year-Old Boy, Nancy Cartwright (who performs the voice of Bart Simpson) wrote that "Kelsey Grammer scores big-time by injecting caustic, bitter, contemptuous and deliciously vile energy into his rendition of Sideshow Bob. Springfield just wouldn't be the same without him."

Erik Adams of The A.V. Club credited Grammer with developing Bob beyond his obsession with killing Bart. Reviewing "Sideshow Bob Roberts", he called Bob a "full-fledged character" whose desire for control extended to humanity as a whole. "Brother from Another Series" reverses Bob's usual relationship with Bart: Bob is innocent and tries to save Springfield while Bart stalks him. Fellow A.V. Club reviewer Gwen Ihnat called the episode a "turning point" in their relationship and suggested that the two were more alike than they thought. Writing for The A.V. Club, Nathan Rabin described Bob as a snob driven by "over-class rage", but argued that he was right to want better television that respected children's intelligence. The joke, in Rabin's view, is that Bob will frame and murder people to achieve those aims. He praised Grammer for bringing out the "aristocratic rage" beneath Bob's good manners.

Many episodes featuring Bob have been well received by critics. "Cape Feare" is generally regarded as one of the best episodes of The Simpsons. and was placed third on Entertainment Weekly's 2003 list of the show's top 25 episodes. IGN considers it the best episode of the fifth season. In 2007, Vanity Fair called it the show's fourth-best episode because of its "masterful integration of filmic parody and a recurring character". In Harper's Magazine, Charles Bock wrote that in the rake sequence, "the degree of repetition, the overlong extension of the joke, was the joke". Ben Rayner of the Toronto Star listed "Cape Feare", "Sideshow Bob's Last Gleaming" and "Brother from Another Series" among the best episodes of the series, calling them Grammer's best roles.

"The Italian Bob" and its writer John Frink won a Writers Guild of America Award in 2007 in the animation category. In December 2009, Robert Canning of IGN ranked the ten Bob episodes that had aired by then. Bob's first five episodes occupied the top five positions, with "Cape Feare" ranked first. "The Italian Bob" was ranked tenth, with the explanation that "All the things we love about a Sideshow Bob episode—the vengeance, the familiar settings and characters, the elaborate scheming—were missing from this half-hour. Without it, Bob wasn't nearly as entertaining, and the episode didn't result in a whole lot of laughs." He noted that "The Italian Bob" and the ninth-ranked "Funeral for a Fiend" were "the only ones I'd consider clunkers. These remaining episodes are all quite fun". Enthusiasm for Grammer's performance did not always extend to the later episodes: The Independent said none had matched "Cape Feare", while a 2019 A.V. Club review said their "comic effectiveness" had "waxed and waned", although Grammer's "obvious joy in the villainous role" remained welcome.

Erik Adams called "Sideshow Bob Roberts" "The Simpsons' finest half-hour of political satire", noting its attacks on uninformed voters and pandering politicians. Stuart Heritage described it in 2018 as the "definitive cultural statement about political populism". In a 2020 interview, UNSW political expert Will Clapton argued that the story could just as easily concern Donald Trump's presidency, despite drawing on the Watergate scandal. He read it as a satire of the media's ability to distort facts and manipulate a "relatively lazy, uninformed, and apathetic electorate". In 2019 and 2021, commentators invoked Bob's line from "Sideshow Bob Roberts" when discussing what they called the "Sideshow Bob defense" of President Donald Trump: "Attempted murder? Now honestly, what is that? Do they give a Nobel Prize for attempted chemistry?"

Analysis

Bob replaces Krusty's slapstick with literary readings in "Krusty Gets Busted" (1990).

In Planet Simpson, author Chris Turner writes that portraying Bob as a highbrow snob and conservative Republican allows the writers to use him repeatedly as a straw man and pincushion. Bob represents high culture, while Krusty represents low culture; Bart occupies the middle ground and always prevails. In the book Leaving Springfield, David L. G. Arnold comments that Bart is a product of a "mass-culture upbringing" and thus is Bob's enemy. Frustrated by his early role as the target of "Krusty's cheap gags", Bob frames Krusty and takes over the show. He changes the show's content to present readings of classic literature and segments examining the emotional lives of preteens. He believes that by exposing children to high culture, he will improve their lives. Arnold writes that "Bob's own conscience and morality are clearly unaffected by the high culture he represents." Through his criminal schemes, he also tries to "manipulate the tastes of the masses".

Arnold considers this manipulation most apparent in "Sideshow Bob Roberts", in which Bob rigs the election to become mayor of Springfield. When accused of election fraud, he rants, "Your guilty consciences may force you to vote Democratic, but secretly you yearn for a cold-hearted Republican who'll cut taxes, brutalize criminals, and rule you like a king! That's why I did this, to protect you from yourselves!" Bob considers himself part of the social elite and uses Machiavellian methods to gain and retain power.

Writing about the film parody "Cape Feare" and Anne Washburn's Mr. Burns, a Post-Electric Play, a play based on the episode, Hans Vermy sees Bob's conflict with Bart as a rivalry between theater and television. He describes Bob as a frustrated artist whose formal speech and taste for theatrical tragedy and comedy contrast with his supporting role on Krusty's show. Bart represents both television's audience and its "champion". Bob wants Krusty's place in the spotlight, and Bart becomes a substitute target for his resentment. Vermy reads their conflict as a "competition between media: fatal contests for applause and audience".

Bob's intelligence serves him in many ways. In "Cape Feare", for example, the parole board asks Bob why he has a tattoo that says "Die, Bart, Die". Bob replies that it is German for "The, Bart, The"; members of the board are impressed by his reasoning. Believing that "nobody who speaks German could be an evil man", they release him. His love of high culture can also work against him. In the same episode, Bob agrees to perform the operetta H.M.S. Pinafore in its entirety to fulfill Bart's last request. The performance delays Bob long enough for the police to arrest him.

Moritz Fink argues that Bob's appearance ties him to the popular culture he despises: his hair and oversized feet mark him as a clown and a cartoon character. He suggests that Bob's recurring role as a villain who is sent back to prison can be read as "narrative prosthesis", the use of disability to shape a story. Yet his feet do not make him an outsider in the cartoon world of The Simpsons. They expose his disguise in "Krusty Gets Busted" and help him crush grapes in "The Italian Bob". What might be treated as a disability becomes, in Fink's words, "an ability rather than a normative deviance".

Media scholars Amy M. Davis, Jemma Gilboy, and James Zborowski describe Bob as an exception to the series' floating timeline. While the Simpson family experiences "eventfulness without progression", Bob's life changes between appearances. His son Gino, for example, grows from a toddler in "The Italian Bob" into an older child in "Funeral for a Fiend", while Bart and Lisa remain ten and eight. The authors contrast Bob, who remains burdened by his past, with Homer, whose adventures leave no lasting consequences.

Bibliography

• Arnold, David L. G. (December 8, 2003). "'Use a Pen, Sideshow Bob': The Simpsons and the Threat of High Culture". In Alberti, John (ed.). Leaving Springfield: The Simpsons and the Possibility of Oppositional Culture. Contemporary Film and Television Series. Detroit: Wayne State University Press. pp. 1–28. ISBN 978-0-8143-2849-1. OCLC 51323494. Retrieved September 4, 2026. pp. 12–13: Bob's own conscience and morality are clearly unaffected by the high culture he represents. ... manipulate the tastes of the masses.
• Bock, Charles (March 2013). "Rake's Progress". Harper's Magazine. Opening discussion of the Rake Scene. Retrieved September 2, 2026. televised comedies weren't doing humor where the degree of repetition, the overlong extension of the joke, was the joke.
• Bradley, Ian (2016) [1996]. "Introduction" (PDF). In Bradley, Ian (ed.). The Complete Annotated Gilbert and Sullivan (20th anniversary ed.). New York: Oxford University Press. pp. x–xi. ISBN 978-0-19-939242-1. LCCN 2015037066. OCLC 925355179. Retrieved September 2, 2026. Bart, marooned on a houseboat, averts death at the hands of Sideshow Bob.
• Canning, Robert (December 2, 2009). "The Simpsons: Top 10 Sideshow Bob Episodes". IGN. introduction and ranked list, nos. 10–1. Archived from the original on March 14, 2016. Retrieved September 4, 2026. the only ones I'd consider clunkers. These remaining episodes are all quite fun ...
• Davis, Amy M.; Gilboy, Jemma; Zborowski, James (November 2015). "How Time Works in The Simpsons". Animation. 10 (3): 175–188. doi:10.1177/1746847715602403. ISSN 1746-8477. Retrieved September 2, 2026. pp. 175, 181–184: Bob is offered ... to experience the passage of time and accumulate and retain an eventful history. ... eventfulness without progression.
• EA Mobile (April 14, 2015). The Simpsons: Tapped Out (iOS and Android) (4.14 (“Terwilligers”) ed.). Electronic Arts. Level/area: Terwilligers event. Sideshow Bob is back, and he's brought the whole family!
• Farnell, Ian (2021). Contemporary British Theatre and Science Fiction: Staging the Final Frontier (PDF) (PhD thesis). University of Warwick. p. 65. Retrieved September 2, 2026. Cape Feare ... lampoons both the 1962 psychological crime film Cape Fear and its 1991 remake.
• Fink, Moritz (2013). "'People Who Look Like Things': Representations of Disability in The Simpsons" (PDF). Journal of Literary & Cultural Disability Studies. 7 (3): 255–270. doi:10.3828/jlcds.2013.23. ISSN 1757-6458. Retrieved September 2, 2026. pp. 261–262: an agent of high culture and intellectual enlightenment ... rendered an ability rather than a normative deviance.
• Fink, Moritz (2019). The Simpsons: A Cultural History. The Cultural History of Television (1st ed.). Lanham, Maryland: Rowman & Littlefield. pp. 99–100. ISBN 978-1-5381-1616-6. LCCN 2018053490. OCLC 1073034234. Retrieved September 4, 2026. a rivalry that may be viewed as an allusion to Warner Bros.' Wile E. Coyote unsuccessfully attempting to catch the Road Runner.
• von der Goltz, Wanja Matthias Freiherr (July 5, 2011). Functions of Intertextuality and Intermediality in The Simpsons (PDF). Faculty of Humanities (Dr. phil. thesis). University of Duisburg-Essen. Retrieved September 4, 2026. pp. 123–124: Sideshow Bob ... develops a fiendish plan to abolish television: he steals an atomic bomb and blackmails the city to turn off all broadcast.
• Groening, Matt (1997). Richmond, Ray; Coffman, Antonia (eds.). The Simpsons: A Complete Guide to Our Favorite Family (1st ed.). New York: Harper Perennial. ISBN 978-0-06-095252-5. LCCN 98141857. OCLC 37796735. OL 433519M. pp. 28–29: Krusty Gets Busted
• Matt Groening, Brad Bird, Jay Kogen, and Wallace Wolodarsky (commentators) (September 25, 2001). "Commentary for 'Krusty Gets Busted'". The Simpsons: The Complete First Season (DVD audio commentary). 20th Century Fox Home Entertainment. When the script came out ... they were talking about getting James Earl Jones.
• Matt Groening, Al Jean, Mike Reiss, Julie Kavner, David Silverman, and Jon Vitti (commentators) (August 26, 2003). "Commentary for 'Black Widower'". The Simpsons: The Complete Third Season (DVD audio commentary). 20th Century Fox Home Entertainment. we're gonna have him keep coming back, sort of like the Coyote continuing to try to get the Road Runner.
• Groening, Matt (October 26, 2010). Richmond, Ray; Gimple, Scott M.; McCann, Jesse L.; Seghers, Christine; Bates, James W. (eds.). Simpsons World: The Ultimate Episode Guide: Seasons 1–20 (1st ed.). New York: Harper. ISBN 978-0-06-171128-2. LCCN 2010526286. OCLC 676695317. pp. 207, 1183, 1193: Robert Underdunk Terwilliger
• Jean, Al (December 21, 2004). "Commentary for 'Cape Feare'". The Simpsons: The Complete Fifth Season (DVD audio commentary). 20th Century Fox Home Entertainment. The reason there are so many was ... because the show was short ... add a couple more rakes hitting him.
• Ken Keeler, Josh Weinstein, Kelsey Grammer, and Pete Michels (commentators) (August 15, 2006). "Commentary for 'Brother from Another Series'". The Simpsons: The Complete Eighth Season (DVD audio commentary). 20th Century Fox Home Entertainment. I'd been watching a lot of Frasier at the time ... the germ of the idea was ... what if we have Sideshow Bob's brother?
• Kleinman, Jake (October 11, 2024). "How Sideshow Bob Became a Disney Villain". Inverse (Interview with Al Jean). Questions about Bob's casting and singing. Retrieved September 4, 2026. he loves to sing, which is one of the reasons he was cast as Bob by Sam Simon ... Sam had worked on Cheers
• Middleton, Alison (2021). "'Homer' Tackles Aeschylus: Theatrical Adaptation as Process in Anne Washburn's Mr Burns and Robert Icke's Oresteia" (PDF). Skenè: Journal of Theatre and Drama Studies. 7 (1): 169–194. ISSN 2421-4353. Retrieved September 4, 2026. pp. 171, 180: follows "Cape Feare" ... the tattoos of Simpsons' villain Sideshow Bob are influenced by ... The Night of the Hunter
• Mirkin, David (August 16, 2005). "Commentary for 'Sideshow Bob Roberts'". The Simpsons: The Complete Sixth Season (DVD audio commentary). 20th Century Fox Home Entertainment. Kelsey Grammer is one of the greatest joys to direct ... He works so hard. He's so funny.
• Motzkus, Peter (2020). "SIMPSONS, Inc. (?!)—A Very Short Fascicle on Music's Dramaturgy and Use in Adult Animation Series". Kieler Beiträge zur Filmmusikforschung (15): 65–114. doi:10.59056/kbzf.2020.15.p65-114. Retrieved September 2, 2026. p. 80: The leitmotif is derived from Bernard Herrmann's main theme music for CAPE FEAR.
• Bill Oakley, Josh Weinstein, and Dominic Polcino (commentators) (December 13, 2005). "Commentary for 'Sideshow Bob's Last Gleaming'". The Simpsons: The Complete Seventh Season (DVD audio commentary). 20th Century Fox Home Entertainment. Sideshow Bob ... is one of the more complicated characters to write for ... he often speaks in such a highfalutin complicated way.
• Taylor, Blake (April 29, 2023). "Every Sideshow Bob Episode of The Simpsons, Ranked Worst to Best". /Film. § "The Italian Bob". Retrieved September 4, 2026. These new characters dimensionalize the longtime villain while retaining his essence as a bad guy 17 seasons into the series.
• Tucker, Ken (February 7, 2003). "The Family Dynamic: At 300 episodes and counting, the Simpsons—TV's answer to the great American novel—continues to be a show about everything". Entertainment Weekly. No. 694. pp. 28–43. Archived from the original on October 18, 2014. Retrieved September 1, 2026. Kelsey Grammer's grand voice-performance as Sideshow Bob is Frasier pickled in arsenic. ... 3. CAPE FEARE ... genius in its repetitive stupidity.
• Turner, Chris (2004). Planet Simpson: How a Cartoon Masterpiece Documented an Era and Defined a Generation. Foreword by Douglas Coupland (1st ed.). Toronto: Random House Canada. ISBN 978-0-679-31318-2. OCLC 55682258. pp. 129–131: a feast of mid-Atlantic anglophilia
• Vermy, Hans (March 29, 2014). "The Lightest Distinction". InVisible Culture (20). University of Rochester. doi:10.47761/494a02f6.11bc1dc5. ISSN 1097-3710. Retrieved September 2, 2026. pp. 13–14: For Sideshow Bob, Bart Simpson epitomizes not only the viewer, but also the champion of television. ... competition between media: fatal contests for applause and audience.
• Wehner, Michael; Reinkunz, Sebastian; Flory, Isabel (March 16, 2009). "Civic Education with The Simpsons". Journal of Social Science Education. 7 (2): 86–97. doi:10.4119/jsse-444. Retrieved September 2, 2026. p. 90: He wins in a landslide, getting 100 percent of the vote.
• Whitmire, Kendra Ann (2012). The Uses of Shakespeare on American TV 1990–2010 (PDF). Shakespeare Institute, School of English, Drama and American & Canadian Studies (MPhil thesis). University of Birmingham. pp. 96–98. Retrieved September 4, 2026. pp. 96–97: He is an elitist who detests lowbrow culture ... stands for highbrow and the Simpson family ... lowbrow entertainment.