- Dr. Frederick Frankenstein as Finn
- Igor as Donut Guy
- The Monster as Jermaine
- Inga as Fionna
- Frau Blucher as Princess Bubblegum
- Elizabeth as Lady Rainicorn
- Inspector Kemp as Jake
- Herr Falkstein as Donut Guy
- Mr. Hilltop as Duke of Nuts
- Medical Student as Cinnamon Bun
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