Teenage Mutant Ninja Turtles is an American animated television series developed by Lloyd Goldfine. It is the second animated series and third television series in the Teenage Mutant Ninja Turtles franchise. The series premiered on February 8, 2003, as part of Fox's FoxBox programming block and ended on February 28, 2009. A sequel film, Turtles Forever, serving as both the series finale of the series and a crossover with the 1987–1996 Teenage Mutant Ninja Turtles animated series, was released on November 21, 2009.

Teenage Mutant Ninja Turtles, commonly abbreviated as TMNT, is a media franchise created by the comic book artists Kevin Eastman and Peter Laird. It follows Leonardo, Donatello, Raphael and Michelangelo, four anthropomorphic turtle brothers trained in ninjutsu who fight evil in New York City. Supporting characters include the turtles' sensei, a rat called Splinter, their human friends April O'Neil and Casey Jones, and enemies such as Baxter Stockman, Krang, and their archenemy, the Shredder.