This is a list of episodes of the Teenage Mutant Ninja Turtles 2003 TV series. The series debuted on February 8, 2003 on the Fox Network as part of Fox's 4Kids TV Saturday morning lineup and ended on February 28, 2009. The series was produced by Mirage Studios, which owned one third of the rights to the show. Series overview Series Season 1 (2003) Teenage Mutant Ninja Turtles' first season originally aired between February 8, 2003 and November 1, 2003, beginning with the "Things Change" episode. The episodes were released in two separate volumes, the first on May 22, 2007 with twelve episodes, and the second on September 18, 2007 with fourteen episodes. Season 2 (2003–04) The Shredder returns in season 2 and is revealed to be an Utrom named Ch'rell. Karai, the daughter of the Shredder makes her first appearance in this season. Season 3 (2004–05) Many of the Ninja Turtles' enemies return in season 3. This is the final season that includes Utrom Shredder. Season 4 (2005–06) For the entire season Karai is the leader of the Foot Clan. Hun controls the Purple Dragons. New enemies are seen in this season. Season 5: Ninja Tribunal (2006) To try to increase interest in the series, Fox aired the "Fast Forward" season on commercial TV in 2006. 4Kids Entertainment later signed a deal with Comcast and the season began airing on Comcast-On-Demand in August 2006; however, after airing five episodes, the airing was canceled. Fox later aired the "Membership Drive" episode on March 24, 2007, which was the first episode of the season to air on regular television. 4Kids TV started showing "The Ninja Tribunal" and the 12 completed episodes of this season on February 9, 2008. The season was promoted as the "Lost Episodes" Season 6: Fast Forward (2006–07) The sixth season, subtitled Fast Forward, originally aired between July 29, 2006 and October 27, 2007, beginning with the "Future Shellshock" episode. It includes new designs for all returning characters. Season 7: Back to the Sewer (2008–2009) For most of the final season of the series, subtitled Back to the Sewer, the Shredder of the virtual world of Cyberspace is the main villain, and Master Splinter is trapped deep within virtual limbo with a desperate Donatello resolved to restore his real world form. "Mayhem from Mutant Island" shorts Starting March 7, 2009, a series of 13 shorts, called "chapters", ranging