- Marshal William "Will" Kane as Finn
- Mayor Jonas Henderson as Jake
- Deputy Marshal Harvey Pell as Cinnamon Bun
- Helen Ramirez as Princess Bubblegum
- Amy Fowler Kane as Lady Rainicorn
- Judge Percy Mettrick as Beemo
- Martin Howe as Chet
- Sam Fuller as Choose Goose
- Frank Miller as Flambo
- Mildred Fuller as Young Princess Bubblegum
- Dr. Mahin as Ice King
- Cooper as Mr. Cupcake
- Jack Colby as Duke of Nuts
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