Whatever happened to Bebop, Rocksteady, and Krang?
Those guys were added in with the cartoon. The original comics were just the turtles fighting Shredder and the foot clan, with the help of April and Casey. A lot more ninja-focused than mutant-focused.
As with all cartoons, the really wacky stuff was introduced because you can't keep selling the same boring old human ninja toys to kids. You've got to come up with other mutant animals, and more robotic cars, and flying mutant scientists... *sigh*
If it's more "old school" I might go see it.