Pendleton Ward Lumpy Space Princess Creator, Guest Voice Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Andrew Daly King of Ooo Guest Voice Dee Bradley Baker Varmints, Mother Varmints Guest Voice Andy Milonakis N.E.P.T.R. Guest Voice Chuck McCann Moe Guest Voice Kyle Kinane Cloud Dance Guest Voice Jack Pendarvis Root Beer Guy, Dirt Beer Guy Guest Voice Ava Acres Young Marceline, Bunny Girl Guest Voice Niki Yang Lady Rainicorn Guest Voice Steve Little Peppermint Butler Guest Voice Billy Brown The Vampire King Guest Voice Ron Funches The Fool Guest Voice Olivia Olson Marceline Guest Voice Paul Williams The Hierophant Guest Voice Kent Osborne Secretary Octopus Guest Voice, Writer Rebecca Romijn The Empress Guest Voice Fred Seibert Executive Producer Seo Jung Kim Writer Kelly Crews Producer Somvilay Xayaphone Writer Tom Herpich Writer Ako Castuera Writer Sam Alden Writer Emily Partridge Writer Graham Falk Writer Kristen Mukai Writer KC Green Writer Kirsten Lepore Writer Steve Wolfhard Writer Jesse Moynihan Writer Hanna Nystrom Writer Adam Muto Writer Luke Pearson Writer Bong Hee Han Director