The Cat in the Hat is a famous character created by Dr. Seuss, who is also his most popular character. His sidekicks are Thing 1 and Thing 2. He first appeared in the self-titled book, The Cat in the Hat, released in 1957.
- His list of TV and movie portrayers include the following:
- Allan Sherman in the 1971 animated special and Dr. Seuss on the Loose
- Mason Adams in the 1982 special The Grinch Grinches The Cat in the Hat
- Matt Frewer (who also does Panic) in the 1994 TV movie In Search of Dr. Seuss
- Henry Gibson in the 1995 Daisy-Head Mayzie TV special.
- Bruce Lanoil is season 1 of Jim Henson's The Wubbulous World of Dr. Seuss
- Martin P. Robinson (who also does Snuffy and Telly) in season 2 of Jim Henson's The Wubbulous World of Dr. Seuss
- Charles Martinet (who also does Mario and Luigi) in the educational Dr. Seuss CD-Rom's, which he also hosted.
- Rosie O'Donnell (who also does Terk) in a performance of the Broadway hit Seussical. She was the first of other girls who often play the Cat in Seussical, where he plays narrator.
- Mike Myers (who also does Shrek) in the 2003 Universal/Dreamworks film
- Martin Short (who also does Huy, Hubie, Stubbs the Clown and Stefano) in The Cat in the Hat Knows A Lot About That!
- The Cat's best friends with Barney the Dinosaur, and is the third-in-command of his Adventures team. He will first join him in Barney and The Cat in the Hat. He will also be the host and narrator of selected Barney Adventures movies and double features, starting with Barney meets Oz the Great and Powerful.