- Adam Cassidy as Finn
- Nicholas Wyatt as Mr. Cupcake
- Emma Jennings as Princess Bubblegum
- Augustine Goddard as Duke of Nuts
- Kevin as Jake
- Dr. Judith Bolton as Fionna
- Miles Meachum as Cinnamon Bun
- Agent Gamble as Choose Goose
- Frank Cassidy as Beemo
- Allison as Lady Rainicorn
- Tom Lundgren as Donut Guy
- Nora Sommers as Cake
- Richard McAllister as Jermaine
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