The Cat in the Hat Knows a Lot About That! has 40 half-hour episodes. PBS Kids renewed it for a second season of 20 episodes which premiered on September 10, 2012. A 20 episode third season is currently in development. Each episode features The Cat in the Hat (voiced by Martin Short), who leads neighbours Nick and Sally, the Fish, and Thing One and Thing Two on a variety of adventures in his "Thinga-ma-jigger", a Seussian contraption that can sprout wings, pontoons, booster rockets, change size, and do just about anything else necessary to further the adventure. The adventures are prompted by a question posed by either Nick or Sally
The Cat in the Hat (film) character was designed by Steve Johnson. The Cat costume was made of angora and human hair and was fitted with a cooling system. To keep Myers cool during the outdoor shoots, a portable air conditioner was available that connected a hose to the suit between shots. The tail and ears were battery operated. The Fish was considered somewhat of a unique character for Rhythm & Hues (responsible for some of the effects and animation in such films as "Cats & Dogs", "", and "Scooby-Doo"), in that the character had no shoulders, hips or legs, so all of the physical performance