- Dr. Alec Considine as Finn
- Dr. John Paul Otis as Jake
- Lisa Cardigan as Princess Bubblegum
- Dr. Lew Worship as Duke of Nuts
- Gloria as Fionna
- Dr. Sid Lackland as Beemo
- Dr. Sidney Wohl as Choose Goose
- Dr. Dominic Riccio as Chet
- Dr. Madolyn Bruckner as Marceline
- Mildred as Lady Rainicorn
- Nurse Didi Loomis as Ice Cream Lady
- Mrs. Emma Auer as Cake
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