Jeremy Shada (Finn), Pendleton Ward (Lumpy Space Princess (voice)), Olivia Olson (Marceline the Vampire Queen (voice)), John DiMaggio (Jake), Hynden Walch (Princess Bubblegum), Tom Kenny (Ice King (voice)), Maria Bamford (Mimic / Guardian Angel / Goblin King), Dee Bradley Baker (Jelly Monster / Eyeball Monster / Bucket Knight), Niki Yang (BMO / Lady Rainicorn (voice)), Clancy Brown (Evil Guy / Demon Cat), Polly Lou Livingston (Tree Trunks (voice)), John diMaggio (Jake/Big Guy/Crossbow Guy), Steve Little (Peppermint Butler), Jessica DiCicco (Flame Princess)