Ninja Turtles and the Justice League

Ninja Turtles and the Justice League is an animated crossover film, based on the animated Teenage Mutant Ninja Turtles series that aired between February 2003 and February 2003, as well as the animated Justice League continuty that aired between November 2001 and May 2006.

Storyline
When a portal between two alternate Earths opens, the Ninja Turtles cross over with the Justice League.