From Muppet Wiki

The Cat in the Hat starred in The Wubbulous World of Dr. Seuss. A Muppet version of the character created by Dr. Seuss in 1957, the Cat lives in a large playhouse, from which he observes goings on in the Wubbulous World through his Wubbuloscope. Though still speaking in rhyme, he is a sometimes more sedate character than his print counterpart, particularly in the second season. With the assistance of the Little Cats, he serves as mentor to his friend Terrence McBird and acts as gentle host to the home audience.