Horton Hears a Who! (2008)

Jim Carrey

as Horton (voice)

Steve Carell

as Mayor (voice)

Carol Burnett

as Kangaroo (voice)

Will Arnett

as Vlad (voice)

Seth Rogen

as Morton (voice)

Dan Fogler

as Councilman / Yummo Wickersham (voice)

Isla Fisher

as Dr. Mary Lou Larue (voice)

Jonah Hill

as Tommy (voice)

Amy Poehler

as Sally O'Malley (voice)

Jaime Pressly

as Mrs. Quilligan (voice)

Charles Osgood

as Narrator (voice)

Josh Flitter

as Rudy (voice)

Niecy Nash

as Miss Yelp (voice)

Jesse McCartney

as JoJo (voice)

S

Shelby Adamowsky

as Hedy / Hooly (voice)

Jack Angel

as Old Time Who (voice)

C

Caitlin Rose Anderson

as Helen (voice)

E

Emily Anderson

as Heather (voice)

Jan Rabson

as Town Cryer (voice)

John Cygan

as Who (voice)