Phineas and Ferb: Mission Batman

Phineas and Ferb: Mission Batman is a one-hour long crossover episode of the animated series Phineas and Ferb, that features characters from DC Comics Batman, specifically in their incarnations from Batman: The Animated Series and its spin-offs.

From Batman:

 * Diedrich Bader as Batman
 * Colleen O'Shaughnessey as Batgirl
 * Maria Canals Barrera as Officer Renee Montoya
 * Kevin Michael Richardson as The Joker
 * Tara Strong as Harley Quinn
 * Tasia Valenza as Poison Ivy