Batman/Teenage Mutant Ninja Turtles

Batman & TMNT: Heroes Unite is a crossover film.

From Batman:

 * Kevin Conroy as Batman
 * Martin Jarvis as Alfred
 * Scott Menville as Robin
 * Tara Strong as Batgirl
 * Mark Hamill as Joker
 * Grey DeLisle as Catwoman, Vicky Vale
 * Richard H. Williams as Penguin
 * Richard Moll as Two-Face
 * Tasia Valenza as Poison Ivy
 * Bob Hastings as James Gordon

From Teenage Mutant Ninja Turtles:

 * James Arnold Taylor as Leonardo
 * Wayne Grayson as Michelangelo
 * Sam Riegel as Donatello
 * Nolan North as Raphael
 * Darren Dunstan as Splinter
 * Veronica Taylor as April O'Neil
 * Scottie Ray as Shredder
 * Patrick Fraley as Krang
 * Marc Thompson as Casey Jones
 * Jennifer Darling as Irma Langinstein
 * Frank Welker as Tokka
 * Clancy Brown as Rahzar