In the Cat's Playhouse, Terrence McBird is cranky because he refuses to take a "cat nap." Will the Cat, Sam-I-Am and the Little Cats be able to help? In the Wubbulous World, Sarah Hall-Small encounters the scary-looking Yapper-Nap, who frightens everyone in Seussville, but he's actually just sleepy. We also see what our friends in the Wubbulous World dream about.

In the very messy Cat's Playhouse, when the Cat in the Hat loses his bow tie, it's cleaning time! That is, if he and the Little Cats ever get around to In the Wubbulous World, we meet Matthew Katroom, who battles his messy room. And Yertle the Turtle sells Jane Kangaroo a new kind of mess-free Turtle Tree.

In the Cat's Playhouse, it's Terrence's birthday, and he thinks that everyone has forgotten. Actually, they're all planning his surprise party… In the Wubbulous World, Felix Finkledooper celebrates an extra-special 8th birthday with The 8th Birthday Glurk , while Princess Tizz is sad because all of her birthday presents are too rare and precious to play with.

In the Cat's Playhouse, Terrence thinks that the Cat's house is boring. How to convince him otherwise? In the Wubbulous World, Morton, wanting to be more bird-like, searches for a nest with Junior Kangaroo, and Sarah Hall-Small draws pictures of where she might like to live.

In the Cat's Playhouse, Terrence is having trouble with his flower, a purple and pink Happiola. In the Wubbulous World, Milo plants a tree and imagines all the wonderful things it will grow to do, and the Grinch plots to put a stop to the joyous Binky Blossom Festival.

In the Cat's Playhouse, Terrence is being a picky eater, only wanting to eat red birdseed brickle. In the Wubbulous World, the King of Didd has outlawed Bimple Beans, Milo's favorite food, and Milo struggles to convince the king to keep the beans around. The Cat in the Hat also gazes at what everyone has for lunch in the Wubbulous World.

In the Cat's Playhouse, Terrence tries to fly for the first time, and does. But he's scared to try again. In the Wubbulous World, Morton sleeps over at Junior Kangaroo's house for the first time, and it's very different from his house. And Sarah Hall-Small, after buttoning her sweater for the first time, imagines all the other "firsts" she'll have.

In the Cat's Playhouse, a mysterious box has arrived. Terrence is dying to see what's in it, but the Cat keeps him in suspense by stalling. In the Wubbulous World, Sarah Hall-Small imagines what it would be like to send herself to her Grandma Small's house by mail, and a determined Morton takes over for a tired Delivery Bird by delivering a very important package.

In the Cat's Playhouse, rain spoils plans for a picnic, but the Cat saves the day. In the Wubbulous World, Princess Tizz imagines where the most special picnic spot could be. Also, Morton and Junior's plans to explore the jungle to find the Maputo Bird are squelched when Junior gets a thorn in his paw. So Morton and Horton bring the jungle to Junior.

In the Cat's Playhouse, Little Cat Z is sick, and Terrence is afraid he'll catch his cold. It's up to the Cat and the Little Cats to show him how to stay healthy. In the Wubbulous World, Horton rescues and takes care of Sid Spider, much to the chagrin of Jane Kangaroo, who thinks that bugs are creepy and not friendly. We also meet Dr. Gazeat, who takes care of everyone in the Kingdom of Didd.

In the Cat's Playhouse, the cat and Little Cats are building a Door-A-Matic, a contraption that will open the door, but Terrence is skeptical. In the Wubbulous World, Matthew Katroom finds a stick and imagines all the things it can be. Also, Junior Kangaroo builds a sand castle and imagines what it would be like to live inside it.

In the Cat's Playhouse, Terrence is playing Hooble Ball by himself and won't share the game with the Cat, who tries to convince him that things are more fun when shared by two. In the Wubbulous World, Yertle the Turtle is selfish about his prized nut collection and won't share it, even if it means he doesn't have friends. When he meets Earl, a fellow nut-freak, Yertle learns about what friendship means. We also see all sorts of friends in the Wubbulous World.

Everyone in the Cat's Playhouse is making art, but Terrence doesn't think he'd be very good at it, so The Cat in the Hat, the Little Cats and Pam-I-Am help him create a masterpiece. In the Wubbulous World, Princess Tizz and Milo make a mural that tells a wonderful story, and Sarah Hall-Small makes a collage for her mother's birthday.

In the Cat's Playhouse, Terrence is visited by his brother Lester, who drives Terrence crazy. In the Wubbulous World, we see all sorts of families, and Sarah Hall-Small gets a new baby brother.

In the Cat's Playhouse, a storm causes the lights to go out, and Terrence is afraid, but the Cats help out by inventing in-the-dark games. In the Wubbulous World, Sarah Hall-Small imagines what scary noises coming from her closet might be, and the Grinch gets a taste of his own scary medicine when the folks in Seussville give him a scare.

In the Cat's Playhouse, everyone awaits the arrival of Little Cat Fleep, who only speaks in "Fleep." How can they communicate? In the Wubbulous World, Junior Kangaroo gets a visit from his Grandpa Jacob, who's hard of hearing. Also, Matthew and Sarah hunt for Matthew's dog, Goober, by asking for help from people who communicate in different ways.

In the Cat's Playhouse, the Cat in the Hat wants to be a bird. In the Wubbulous World, we see how different creatures get around. Also, Sarah Hall-Small runs in a Seussville race where people use all kinds of ways to get around, including rolling and bouncing.

In the Cat's Playhouse, Terrence wants to play a song with the Cats, but they get carried away and do their own thing. In the Wubbulous World, we see how people help each other in Seussville, and Milo helps a dragon in distress when he's sent to investigate strange smoke coming from a cave.

In the Cat's Playhouse, everyone pretends to be pirates, and they imagine great adventures. In the Wubbulous World, Sarah imagines that she's a superhero, and Junior imagines what it would be like to be more special, with a super-long tail and antlers.