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 Knows a Lot About That! at the beginning of each episode, which will inevitably lead them around the globe to "make natural science discoveries." Similar to other PBS Kids series such as "Curious George" and "Sid the Science Kid", "The Cat in the Hat Knows a Lot About That!" focuses on introducing preschoolers to various science and learning concepts. Various DVDs were released by NCircle Entertainment beginning in late October 2010 where every DVD is in region 1, subtitled in English and Spanish, approximately 60 minutes except for a few, in Dolby Digital, in 5.1 surround and Dolby surround stereo in Spanish. Every DVD has