- Kenneth James Kitsom as Finn
- Dr. Marta Shearing as Fionna
- Eric Buyer as Ice King
- CIA Deputy Director Pamela Landy as Princess Bubblegum
- Terrence Ward as Jake
- Mark Turso as Cinnamon Bun
- Dr. Donald Foite as Beemo
- LARX-03 as Duke of Nuts
- and more
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