SpongeBob SquarePants/Batman

Heroes

 * Spongebob Squarepants as Bruce Wayne/Batman
 * Gary the Snail as Ace the Bat-Hound
 * Mr. Krabs as Alfred Pennyworth
 * Patrick Star as Dick Grayson/Robin
 * Sandy Cheeks as Batgirl

Villains

 * Plankton as The Joker
 * Man Ray as Penguin
 * Karen as Catwoman
 * Tattletale Strangler as Riddler
 * Flats the Flounder as Two Face
 * King Neptune as Mr. Freeze
 * Squidward Tentacles as Dr. Johnathan Crane/The Scarecrow
 * Kevin the Sea Cucumber as Mad Hatter
 * Doctorfish as Mayor Oswald Cobblepot

Version 2

 * Patrick Star as Bruce Wayne/Batman
 * Spongebob Squarepants as Dick Grayson/Robin