Season Three (Book 3: Fire) of Avatar: The Last Airbender, an American animated television series on Nickelodeon, first aired its 21 episodes from September 21, 2007 to July 19, 2008. The season was created by Michael Dante DiMartino (pictured) and Bryan Konietzko and starred Zach Tyler Eisen, Mae Whitman, Jack DeSena, Jessie Flower, Dante Basco, Dee Bradley Baker, Grey DeLisle, and Mark Hamill as character voices. This third and final season focuses on Aang's quest to defeat the tyrannical Fire Lord. In the season's beginning, protagonist Aang and his friends Sokka, Katara, and Toph are traveling through the Fire Nation, conjuring a plan for invading the Fire Nation and looking for a teacher to teach Aang Firebending. Midway through the season, Aang gathers friends he met in previous episodes and leads a failed invasion into the Fire Nation. The final season features twenty-one episodes, one more than the previous two seasons. The season finale consisted of the four episodes airing together as a two-hour television movie. Season Three received a similar positive critical reception to that of the previous seasons. The season, and especially the finale, received much critical acclaim, with praises from sources such as DVD Talk and IGN. Between October 30, 2007 and September 16, 2008, Nickelodeon released four DVD volumes and a "Complete Box Set". Each of the four volume DVDs consisted of one disc and five episodes, with the exception of volume four, which had six episodes, and the boxed set contained all twenty-one episodes on five discs.