Horton Hears a Who! (also known as Dr. Seuss' Horton Hears a Who! or simply Horton) is a 2008 American computer animated adventure comedy film based on the 1954 book of the same name by Dr. Seuss, produced by Blue Sky Studios and distributed by 20th Century Fox. Directed by Jimmy Hayward and Steve Martino in their directorial debuts, the film's screenplay was written by Cinco Paul and Ken Daurio, and features the voices of Jim Carrey and Steve Carell as Horton the Elephant and Mayor Ned McDodd, respectively, alongside Carol Burnett, Will Arnett, Seth Rogen, Dan Fogler, Isla Fisher, Jonah Hill, and Amy Poehler. John Powell composed the film's musical score. It is the fourth screen adaptation of the book following the 1970 Chuck Jones television special, the 1987 Soviet animated short, and t