Jeremy Shada (Fat Man / Mushroom / Finn), John DiMaggio (Jake), Olivia Olson (Marceline the Vampire Queen (voice)), Pendleton Ward (Marauder #7 / Wizard / Other Mountain), Steve Little (Hair Guy), Tom Kenny (Ice King (voice)), Dee Bradley Baker (Baby Fish / Ice Guy / Dragon / Marauder #6 / Bug Child / Baby Finn), Hynden Walch (Princess Bubblegum (voice)), Niki Yang (BMO / Lady Rainicorn (voice)), Matt Jones (Electroid / Marauder #5 / Mountain Man), Polly Lou Livingston (Tree Trunks (voice)), Thomas F. Wilson (Coal Guy / Cat Man / Head Marauder), Maria Bamford (Margaret / Bug Mom / Squid), Kent Osborne (Joshua / Toad), John diMaggio (Jake/Big Guy/Crossbow Guy), Jessica DiCicco (Flame Princess)