Jeremy Shada (Finn), John DiMaggio (Jake), Olivia Olson (Marceline the Vampire Queen (voice)), Niki Yang (Lady Rainicorn), Vincenzo Rauso (Tiffany), Tom Kenny (Ice King (voice)), Pendleton Ward (Old Man Rainicorn / Nerdy Alien Voice / Shelby / Nightmare Rainicorn), Hynden Walch (Princess Bubblegum (voice)), Polly Lou Livingston (Tree Trunks (voice)), John diMaggio (Jake/Big Guy/Crossbow Guy), Dee Bradley Baker (Baby Skeleton/Rock Golem/Horse), Steve Little (Peppermint Butler), Jessica DiCicco (Flame Princess)