Jim Carrey ( Horton
)
Steve Carell ( Horton
)
Jonah Hill ( Horton
)
Seth Rogen ( Horton
)
Amy Poehler ( Horton
)
Isla Fisher ( Horton
)
Will Arnett ( Horton
)
Jaime Pressly ( Horton
)
Shelby Adamowsky ( Horton
)
Jesse McCartney ( Horton
)
Dan Fogler ( Horton
)
Carol Burnett ( Horton
)
Niecy Nash ( Horton
)
Josh Flitter ( Horton
)