- Michael Shayne as Finn
- Myrle Davis as Princess Bubblegum
- Linda Conquest Murdock as Fionna
- Lou Venter as Starchy
- Lt. Breeze as Duke of Nuts
- Lois Morny as Lady Rainicorn
- Alexander Morny as Rigby
- Mrs. Murdock as Cake
- Leslie Burdock as Beemo
- George Anson Phillips as Cinnamon Bun
- Mr. Hensch as Cuber
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