STEVE CARELL takes on the world of DR. SEUSS in his new animated movie, ‘Horton Hears a Who!,’ and ET’s KEVIN FRAZIER is with the new "Mayor of Who-ville"!

"This is a role I could not turn down," Steve gamely says in Seussian prose. "It would make my smile come up from a frown; it was a happy role, something I wanted to do; something I think you should see, and so should you."

In the animated film, out March 14, JIM CARREY (who also took on the title character of the live-action ‘Dr. Seuss’ How the Grinch Stole Christmas’) plays Horton, an elephant who hears voices coming from a speck of dust. He soon discovers, to his amazement, that the land of Who-ville is located on the infinitesimal world and it’s up to him to protect the people who live there. After all, a person is a person, no matter how small!