RJ Hears a Who!

Cast

 * Horton - RJ (Over the Hedge)
 * Morton - James the Cat
 * Mayor - Rex (We're Back! A Dinosaur's Story)
 * Sour Kangaroo - Miss Poogy (The Muppets)
 * Rudy Kangaroo - Robin the Frog (The Muppets)
 * Jojo McDodd - Scrappy Mouse (Mighty Mouse)
 * Sally O'Malley - Elsa (We're Back! A Dinosaur's Story)
 * Dr. Mary Lou LaRue - Miss Lilly (Angelina Ballerina)
 * Vlad Vladikoff - Drake (The Pebble and the Penguin)
 * Councilman - The Panther King (Conker's Bad Fur Day)
 * Jessica Quilligan - Daisy (Barnyard)
 * Tommy - White Rabbit (Alice in Wonderland (1951))
 * Katie - Baby Bug (Thumbelina)
 * Bunny Vlad - Bean Bunny (The Muppets)
 * Whoville Citizens - Chip 'n' Dale Rescue Rangers Characters, Rastamouse Characters and The Country Mouse and City Mouse Adventures
 * Mrs. Quilligan - Fawn Deer (Bonkers)
 * Miss Yelp - Nala (The Lion King)
 * Yummo Wickersham - Von Talon (Valiant)
 * Wickersham Brothers - Penguin's March (Farce of the Penguins), Wolves (Beauty and the Beast and Frozen), and Flying Monkeys (The Wizard of Oz)
 * Nool Animals - The Muppets Characters, TaleSpin Characters and The Fruitties Characters