Teen Titans/Teenage Mutant Ninja Turtles: World's Finest

Teen Titans/Teenage Mutant Ninja Turtles: World's Finest is an American television film produced by Cartoon Network and Mirage Studios.

From Teen Titans:

 * Aquagirl
 * Batgirl
 * Beast Boy
 * Billy Numerous
 * Cyborg
 * Gizmo
 * Jinx
 * Mammoth
 * Raven
 * Red X
 * Robin
 * Robot Commandos
 * See-More
 * Silkie
 * Slade
 * Starfire
 * Supergirl
 * Wonder Girl

From Teenage Mutant Ninja Turtles:

 * Agent Bishop
 * April O 'Neil
 * Bebop
 * Casey Jones (mentioned)
 * Donatello
 * Foot Soldiers
 * Hamato Yoshi (seen in flashback)
 * Hun
 * Irma Langinstein
 * Leatherhead (mentioned)
 * Leonardo
 * Michelangelo
 * Purple Dragons
 * Raphael
 * Rocksteady
 * Shredder
 * Splinter