- Anthony "Hub" Hubbard as Finn
- Major General William Devereaux as Jake
- CIA Officer Elise Kraft as Princess Bubblegum
- FBI Special Agent Frank Haddad as Duke of Nuts
- Khalil Saleh as Beemo
- Samir Nazhde as Starchy
- Sheik Akhmed bin Talal as Choose Goose
- FBI Agent Tina Osu as Fionna
- FBI Agent Mike Johanssen as Mr. Cupcake
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