- Tom Rath as Finn
- Betsy Rath as Fionna
- Ralph Hopkins as Duke of Nuts
- Maria Montagne as Lady Rainicorn
- Judge Bernstein as Donut Guy
- Helen Hopkins as Princess Bubblegum
- Sgt. Caesar Gardella as Cinnamon Bun
- Bill Hawthorne as Jermaine
- Susan Hopkins as Marceline the Vampire Queen
- Janey Rath as Ice Cream Lady
- Gordon Walker as Beemo
- Bill Ogden as Ice King
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