| Cast 22 |
| Mark Hamill - Evil Guy |
| John Kassir - Cloud Groom |
| Kristen Schaal - Boobafina |
| Maria Bamford - Chocoberry |
| Tom Kenny - Princess #1 |
| Isabella Acres - Young Princess Bubblegum |
| Kent Osborne - Joshua |
| Ron Perlman - The Lich |
| Justin Roiland - Earl of Lemongrab |
| Pendleton Ward - Lumpy Space Princess (voice) |
| Tom Kenny - Ice King (voice) |
| Niki Yang - BMO / Lady Rainicorn |
| John DiMaggio - Jake the Dog (voice) |
| Hynden Walch - Princess Bubblegum (voice) |
| Jeremy Shada - Finn the Human (voice) |
| Jessica DiCicco - Flame Princess |
| Dee Bradley Baker - Cinnamon Bun (voice) |
| Polly Lou Livingston - Tree Trunks |
| Steve Little - Peppermint Butler |
| Olivia Olson - Marceline the Vampire Queen (voice) |
| Niki Yang - BMO |
| Maria Bamford - Slime Princess / Additional Voices |
| Writing 7 |
| Sean Jimenez - Writer |
| Niki Yang - Writer |
| Tom Herpich - Writer |
| Kent Osborne - Writer |
| Mark Banker - Writer |
| Cole Sanchez - Writer |
| Tim McKeon - Writer |
| Production 10 |
| Kelly Crews - Producer |
| Brian A. Miller - Executive Producer |
| Jennifer Pelphrey - Executive Producer |
| Curtis Lelash - Executive Producer |
| Rob Sorcher - Executive Producer |
| Pendleton Ward - Executive Producer |
| Fred Seibert - Executive Producer |
| Derek Drymon - Producer |
| Kevin Kolde - Producer |
| Thurop Van Orman - Producer |
| Art 1 |
| Mike Collins - Art Department Manager |
| Network 1 |
| Cartoon Network |
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