Dr. Seuss's ABC/Adventure Time

Cast

 * Ichabod as Finn
 * Bubble Boy as Jake
 * Discord (from My Little Pony: Friendship is Magic) as Ice King
 * RJ (from Over the Hedge) as Beemo
 * Margaret (from Regular Show) as Lady Rainicorn
 * Itsy as Princess Bubblegum
 * Inez (from Cyberchase) as Marceline The Vampire Queen