- Frederick Henry as Finn
- Catherine Barkley as Fionna
- Major Alessandro Rinaldi as Jake
- Dr. Emerich as Choose Goose
- Miss Van Campen as Princess Bubblegum
- Helen Ferguson as Lady Rainicorn
- Colonel Valentini as Cinnamon Bun
- Major Stampi (as Jose Nieto) as Muscle Prince
- Captain Bassi (as Georges Brehat) as Mr. Cupcake
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