- Professor Harold Hill as Finn
- Marian Paroo as Lady Rainicorn
- Marcellus Washbum as Jake
- Mayor George Shinn as Duke of Nuts
- Eulalie Mackenchie Shinn as Princess Bubblegum
- Mrs. Paroo as Fionna
- Tommy Dijilas as Starchy
- Zaneeta Shinn as Ice Cream Lady
- Winthrop Paroo as Beemo
- Charlie Cowell as Chet
- Constable Locke as Donut Guy
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