- Brandon Gatson
- Narrator
- Ashley Ausburn
- Self
- Joshua Curls
- Self
- Kaela Elmido
- Self
- Cydney-Elise Koné
- Self
- Rico Rodriguez
- Self
- Lark Dimond-Cates
- Self -Scupltor, Step-Daughter of Ted Geisel 'Dr. Seuss'
- Paul Dini
- Self - Animation Producer
- Bill Dreyer
- Self - Curator of 'The Art of Dr. Seuss' Touring Exhibition
- Audrey Geisel
- Self - Wife of Ted Geisel ('Dr. Seuss')
- Kathleen Krull
- Self - Author of 'The Boy on Fairfield Street'
- Marian Jones
- Self - Wife of Animator Chuck Jones
- Peter Jones
- Self - Writer of 'Dr. Seuss: Rhymes and Reasons'
- Boris Karloff
- Narrator / The Grinch (archive footage) (uncredited)
