Jim Carrey and Steve Carell are taking their voice to Who-Ville in Dr. Suess' Horton Hears A Who for 20th Century Fox.

Jim will play Horton, while Steve has been cast as the mayor of Who-Ville in the CG-animated flick. The Hollywood Reporter notes this will be the second time Carrey is in a Suess film; he starred as the lead in How the Grinch Stole Christmas.

Horton Hears A Who has a 2008 release set.