Cast[]
- Finn as Thomas
- Jake as Percy
- Ice King as Diesel
- BMO as James
- Lady Rainicorn as Molly
- Princess Bubblegum as Emily
- Marceline as Daisy
- Chet as Bertie
- Mr. Cupcake as Gordon
- Starchy as Toby
- Cinnamon Bum as Henry
- Si Slicer as Spencer
- Duke of Nuts as Edward
- Death as D261
- Candy People and Marshmallow Kids as Narrow Gauge Engines
- Cuties and Goblins as Foolish Freight Cars
- Lich as Diesel 10
- Donut Guy as BoCo
- Flame Princess as Rosie
- Ice Cream Lady as Mavis
- Flambo as Billy
- Choose Goose as Duck
- Jermaine as Harvey
- Lumpy Space Princess as Elizabeth
- Muscle Princess as Belle
- Donny as Hector