- Jason Bourne as Finn
- Marie Helena Kreutz as Fionna
- Alexander Conklin as Jake
- Ward Abbott as Starchy
- The Professor as Ice King
- Nykwana Wombosi as Beemo
- Danny Zorn as Donut Guy
- Nicolette Parsons as Princess Bubblegum
- Research Tech #1 as Duke of Nuts
- Research Tech #2 as Chet
- Giancarlo as Flambo
- Eamon as Jeramine
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