- Rose Loomis as Fionna
- George Loomis as Finn
- Polly Cutler as Jake
- Ray Cutler (billed as Casey Adams) as Cinnamon Bun
- Inspector Starkey as Choose Goose
- Patrick as Starchy
- Mr. Kettering as Beemo
- Mrs. Kettering as Princess Bubblegum
- Mr. Qua as Mr. Cupcake
- Boatman as Duke of Nuts
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