- Johnny Cash as Finn
- June Carter Cash as Lady Rainicorn
- Vivian Liberto as Princess Bubblegum
- Ray Cash as Jake
- Rosanne Cash as Ice Cream Lady
- Sam Phillips as Duke of Nuts
- Luther Perkins as Choose Goose
- Carl Perkins as Cinnamon Bun
- Marshall Grant as Muscle Prince
- Shelby Lynne as Fionna
- Jerry Lee Lewis as Donut Guy
- Jack Cash as Mr. Cupcake
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