| Cast overview, first billed only: | |||
| Jim Carrey | ... | Horton (voice) | |
| Steve Carell | ... | Mayor (voice) | |
| Carol Burnett | ... | Kangaroo (voice) | |
| Will Arnett | ... | Vlad (voice) | |
| Seth Rogen | ... | Morton (voice) | |
| Dan Fogler | ... | Councilman / Yummo Wickersham (voice) | |
| Isla Fisher | ... | Dr. Mary Lou Larue (voice) | |
| Jonah Hill | ... | Tommy (voice) | |
| Amy Poehler | ... | Sally O'Malley (voice) | |
| Jaime Pressly | ... | Mrs. Quilligan (voice) | |
| Charles Osgood | ... | Narrator (voice) | |
| Josh Flitter | ... | Rudy (voice) | |
| Niecy Nash | ... | Miss Yelp (voice) | |
| Jesse McCartney | ... | JoJo (voice) | |
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Shelby Adamowsky | ... | Hedy / Hooly / Additional Voices (voice) |
One day, Horton the elephant hears a cry from help coming from a speck of dust. Even though he can't see anyone on the speck, he decides to help it. As it turns out, the speck of dust is home to the Whos, who live in their city of Whoville. Horton agrees to help protect the Whos and their home, but this gives him nothing but torment from his neighbors, who refuse to believe that anything could survive on the speck. Still, Horton stands by the motto that, "After all, a person is a person, no matter how small." Written by Griffin84
In the jungle of Nool, the elephant Horton hears a voice in a speck; he uses a clover to rescue the speck of dust and he makes contact with the Mayor of Whoville. Horton discovers that in that tiny speck there is a city crowded of people and he decides to leave Whoville in a safe place. However, the evil Kangaroo does not believe in his words and finds Horton dangerous for the children of Nool, making them believe in what they can not see, hear or feel, and incites the animals against Horton.
With the message "A Person Is a Person No Matter How Small", "Horton Hears a Who!" is a lesson of respect and rights of the minorities through hilarious situations. The animation is awesome, the characters are nice and I liked this great family entertainment. My vote is seven.
Title (Brazil): "Horton e o Mundo dos Quem!" ("Horton and the World of Who!")