Bill Farmer в ролята на Willie Bear / Additional Voices (voice)
Steve Carell в ролята на The Mayor of Whoville (voice)
Jim Carrey в ролята на Horton (voice)
Carol Burnett в ролята на Kangaroo (voice)
Will Arnett в ролята на Vlad (voice)
Seth Rogen в ролята на Morton (voice)
Isla Fisher в ролята на Dr. Mary Lou Larue (voice)
Jonah Hill в ролята на Tommy (voice)
Dan Fogler в ролята на Councilman / Yummo Wickersham (voice)
Amy Poehler в ролята на Sally O'Malley (voice)
Jaime Pressly в ролята на Mrs. Quilligan (voice)
Charles Osgood в ролята на Narrator (voice)
Josh Flitter в ролята на Rudy (voice)
Ariel Winter в ролята на Additional Voices (voice)
Niecy Nash в ролята на Miss Yelp (voice)
Jesse McCartney в ролята на JoJo (voice)
Shelby Adamowsky в ролята на Hedy / Hooly / Additional Voices (voice)
Jack Angel в ролята на Old Time Who / Additional Voices (voice)
Caitlin Rose Anderson в ролята на Helen (voice)
Emily Anderson в ролята на Heather (voice)
Jan Rabson в ролята на Town Cryer / Additional Voices (voice)
John Cygan в ролята на Who / Additional Voices (voice)
Jess Harnell в ролята на Another Who / Additional Voices (voice)
Debi Derryberry в ролята на Who Mom / Additional Voices (voice)
Samantha Droke в ролята на Hildy / Holly (voice)
Karen Disher в ролята на Who Kid (voice)
Marshall Efron в ролята на Wickersham Guard 1 (voice)
Jason Fricchione в ролята на Joe (voice)
Heather Goldenhersh в ролята на Who Girl / Additional Voices (voice)
Selena Gomez в ролята на Helga (voice)
Jimmy Hayward в ролята на Obnoxious Who (voice)
Joey King в ролята на Katie (voice)
Christina Martino в ролята на Heidi / Haley (voice)
Ellie Martino в ролята на Hanna / Additional Voices (voice)
Laraine Newman в ролята на Glummox Mom / Additional Voices (voice)
Tim Nordquist в ролята на Wickersham Guard 2 (voice)
Colleen O'Shaughnessey в ролята на Angela / Additional Voices (voice)
Laura Ortiz в ролята на Jessica (voice)
Joe Pasquale в ролята на The Dentist (voice)
Connor Anderson в ролята на Who Child #1 (voice)
Isabella Acres в ролята на Additional Voices (voice)
Bob Bergen в ролята на Additional Voices (voice)
Jeff Biancalana в ролята на Additional Voices (voice)
Madison Davenport в ролята на Additional Voices (voice)
Teresa Ganzel в ролята на Additional Voices (voice)
Kathy Graves Toon в ролята на Additional Voice (voice)
Sherry Lynn в ролята на Additional Voices (voice)
Sherry Lynn в ролята на Additional Voice (voice)
Danny Mann в ролята на Additional Voices (voice)
Mona Marshall в ролята на Additional Voices (voice)
Mickie McGowan в ролята на Additional Voices (voice)
Madison Pettis в ролята на Additional Voices (voice)
Grace Rolek в ролята на Additional Voices (voice)
Jennessa Rose в ролята на Additional Voices (voice)
