Adventure Time, Regular Show and The Amazing World of Gumball/Number of the Day 20 (from Sesame Street)

Cast

 * Gumball (from The Amazing World of Gumball) as Count von Count
 * Finn (from Adventure Time), Jake (from Adventure Time), Princess Bubblegum (from Adventure Time), Ice King (from Adventure Time), Mordecai (from Regular Show), Rigby (from Regular Show), Benson (from Regular Show), Skips (from Regular Show), Pops (from Regular Show), Muscle Man (from Regular Show), Margaret (from Regular Show), Eileen (from Regular Show), Darwin (from The Amazing World of Gumball), Anais (from The Amazing World of Gumball), Nicole (from The Amazing World of Gumball), Richard (from The Amazing World of Gumball), Penny (from The Amazing World of Gumball), Banana Joe (from The Amazing World of Gumball), Tobias (from The Amazing World of Gumball) and Rocky Robinson (from The Amazing World of Gumball) as Pipe Organ