Horton Hears a Who!

Joey King as Katie (voice) Teresa Ganzel as Additional Voices (voice) Seth Rogen as Morton (voice) Isla Fisher as Dr. Mary Lou Larue (voice) Debi Derryberry as Who Mom (voice) Heather Goldenhersh as Who Girl (voice) Jimmy Hayward as Obnoxious Who (voice) Laura Ortiz as Jessica (voice) Sherry Lynn as Additional Voices (voice) Dan Fogler as Councilman / Yummo Wickersham (voice) Niecy Nash-Betts as Miss Yelp (voice) Karen Disher as Who Kid (voice) Selena Gomez as Helga (voice) Danny Mann as Additional Voices (voice) Madison Pettis as Additional Voices (voice) Steve Carell as Mayor (voice) Jonah Hill as Tommy (voice) Charles Osgood as Narrator (voice) Jack Angel as Old Time Who (voice) Jan Rabson as Town Cryer (voice) Bob Bergen as Additional Voices (voice) Ariel Winter as Additional Voices (voice) Jess Harnell as Another Who (voice) Samantha Droke as Hildy / Holly (voice) Marshall Efron as Wickersham Guard 1 (voice) Laraine Newman as Glummox Mom (voice) Mona Marshall as Additional Voices (voice) Amy Poehler as Sally O'Malley (voice) Josh Flitter as Rudy (voice) Jesse McCartney as JoJo (voice) John Cygan as Who (voice) Bill Farmer as Willie Bear (voice) Colleen O'Shaughnessey as Angela (voice) Carol Burnett as Kangaroo (voice) Jaime Pressly as Mrs. Quilligan (voice) Joe Pasquale as The Dentist (voice) Madison Davenport as Additional Voices (voice) Grace Rolek as Additional Voices (voice) Fletcher Sheridan as Jojo (singing voice) (uncredited) Isabella Acres as Additional Voices (voice) Mickie McGowan as Additional Voices (voice) Jim Carrey as Horton (voice) Will Arnett as Vlad (voice)

Moroni Taylor Storyboard Artist Ken Daurio Screenplay Audrey Geisel Executive Producer Karen Disher Storyboard Artist Thomas Cardone Art Direction Paul Downs Animation Crystal Chesney Additional Storyboarding Rich Moore Additional Storyboarding Dr. Seuss Book J.G. Quintel Additional Storyboarding Chris Meledandri Executive Producer Dennis Leonard Supervising Sound Editor Chris Renaud Storyboard Artist Frank Marino Additional Storyboarding Mac Smith Sound Effects Editor Chris Wedge Executive Producer Cal Brunker Storyboard Artist Jimmy Hayward Director Randy Thom Sound Designer, Supervising Sound Editor Steve Martino Director John Powell Original Music Composer Cinco Paul Screenplay