- Ramona Quimby as Lady Rainicorn
- Beezus Quimby as Princess Bubblegum
- Henry Huggins as Finn
- Aunt Bea as Fionna
- Robert Quimby as Donut Guy
- Hobart as Duke of Nuts
- Howie Kemp as Jake
- Mrs. Meacham as Ice Cream Lady
- Roberta Quimby as Cake
- Susan Kushner as Marceline
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