Cast[]
- Finn as The Cat in the Hat
- Jake as Sam-I-Am
- Ice King as The Grinch
- Beemo as Norval the Fish
- Lady Rainicorn as Pam-I-Am
- Princess Bubblegum as Sarah Hall-Small
- Marceline the Vampire Queen as Jane Kangaroo
- Chet as Little Cat Fleep
- Mr. Cupcake as Joey
- Starchy as Mr. Brown
- Cinnamon Bun as Horton the Elephant
- Sir Slicer as Yertle the Turtle
- Duke of Nuts as Mack the Turtle
- Cuties and Goblins as Wickershams
- Donut Guy as Thidwick the Big-Hearted Moose
- Fionna as Cindy Lou Who
- Cake as Daisy-Head Mayzie
- Flambo as Young Cat in the Hat
- Ice Cream Lady as The White-Tufted Floozle Bird
- Choose Goose as The Lorax
- Jermaine as Conrad
- Muscle Prince as Sylvester McMonkey McBean
- Donny as The Yapper-Nap
- and more