Teenage Mutant Ninja Turtles' first season originally aired between February 8, 2003 and November 1, 2003, beginning with the "Things Change" episode.
To try and increase interest in the series, Fox aired the "Fast Forward" season on commercial TV in 2006.
4Kids TV started showing "The Ninja Tribunal" and the 12 completed episodes of this season weekly beginning on February 16, 2008.
The sixth season, subtitled Fast Forward, originally aired between July 29, 2006 and October 27, 2007, beginning with the episode "Future Shellshock.
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.