Batman/Teenage Mutant Ninja Turtles

Batman & TMNT: Heroes Unite is a crossover film.

From The Batman:

 * Rino Romano as The Batman/Bruce Wayne
 * Tara Strong as Vicki Vale
 * Tom Kenny as The Penguin
 * Kevin Michael Richardson as The Joker
 * Alastair Duncan as Alfred Pennyworth

From Teenage Mutant Ninja Turtles:

 * Michael Sinterniklass as Leonardo
 * Wayne Grayson as Michelangelo
 * Sam Riegel as Donatello
 * Greg Abbey as Raphael
 * Scottie Ray as Shredder
 * Darren Dunstan as Splinter
 * Veronica Taylor as April O'Neil
 * Marc Thompson as Casey Jones
 * Greg Carey as Hun
 * Karen Neill as Karai