• Tom Rath as Finn
  • Betsy Rath as Fionna
  • Ralph Hopkins as Duke of Nuts
  • Maria Montagne as Lady Rainicorn
  • Judge Bernstein as Donut Guy
  • Helen Hopkins as Princess Bubblegum
  • Sgt. Caesar Gardella as Cinnamon Bun
  • Bill Hawthorne as Jermaine
  • Susan Hopkins as Marceline the Vampire Queen
  • Janey Rath as Ice Cream Lady
  • Gordon Walker as Beemo
  • Bill Ogden as Ice King

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