A Long Winter's Nap - Sally and Nick are so excited to go ice skating tomorrow, that they can't fall asleep! Cat's friend Boris the bear can help! Off they go to the Gleep-sneep Woods to learn how Boris gets ready to take his long winter's nap. Back at home, Nick and Sally follow Boris' advice, and follow their own bedtime routine to get ready for bed. With the help of a bedtime story from Cat, they quickly fall asleep.The Tree Doctor - Sally's little maple sapling hasn't grown any bigger! To discover why, the Cat in the Hat takes the kids to meet Dr. Twiggles. With the help of the tree doctor and his songs, Nick and Sally discover how trees "eat"; - through their leaves and roots. They also learn that trees grow verrrry slowly. A few more years and their maple sapling will grow into a maple tree!

Thump - Nick is trying to make his mother a surprise lunch, but she keeps coming into the kitchen! If only there was a way for him to know when she was coming. The Cat takes Nick and Sally to meet his friend Twitch the rabbit. Twitch and her bunnies teach Nick and Sally how to stop, look and listen for danger. Now Sally that can warn Nick when his mom is coming, they're able to surprise her with lunch!Squirreled Away - Nick can't remember where he put his yoyo. Cat offers to take the kids to meet his friend Bucky the squirrel who is good at both hiding and finding things! Nick and Sally learn how to use landmarks to help them remember where they put things. Back at home Nick, thinking like Bucky, is able to track down his yoyo!

No Night Today - Nick and Sally want to keep playing, but it's getting dark. Why does nighttime have to come? The Cat knows someone who can answer that question - Astronaut Audrey! With a trip to her International Space Station and a large model of the solar system, the kids learn that it's the earth's spinning near the sun that makes it night or day.Fun in the Sun - Phew it's hot! Too hot to play outside. Not according to The Cat! His friend Hilda the Hippo knows all about having fun in the sun. A visit to Muddymoo River teaches them that hippos make their very own sunscreen to protect them from the hot sun. Now that they all have their sunscreen on, it's time for some fun in the sun!

Little Lemmings - It's cold outside, but Nick and Sally want to keep playing. Is there a way to stay warm out in the cold? Cat's friend Lars the Lemming will know! He lives in the Wundra-Bundra-Tundra. It's cold out, but with Lars' fur coat, he doesn't even notice! They help Lars find a new home, one where there's more food for him and his family and they discover that he uses the snow to help keep him warm! Back at home the kids wear two winter coats to help them keep warm. But what's even warmer than that, hot chocolate!Keep the Beat - Nick and Sally have been running around the backyard and now their chests are thumpity thumping! The Cat explains that that is their hearts boom boom booming! But why? wonders Sally. A visit to Dr. Giggles will answer that question. By shrinking down super small, they follow Dr. Giggles' directions to follow the path that blood takes, learning about how the heart is a pump. They watch Thing 2's heart beat faster when he runs, and slows down when he stops. With all this running around, their bodies are now making another sound - rumbling tummies!

Tough Enough - Nick and Sally are trying to guess what animal is the toughest one - is it a lion? Oh no, it must be the enormous elephant! Why not at all, says The Cat. The toughest of all is a teeny tiny Waterbear. Huh? Off to meet Cat's friend Wally the Waterbear. After shrinking down in the Thingamajigger, they find Wally and start to play the Tough Enough game! Wally is tough enough to live anywhere, so it's off to Freeze Your Knees Snowland to test it out. Then they go to the super hot Gritchity-Gratch Desert, then even a trip into space! Wally can live anywhere! He really is the toughest of all!How Cool is Coral - The Cat needs help! He needs to get his fish friend Ting Tang Tony back to his family. Off to Scoobamareen they go! Tony and Cat got distracted while he was drawing pictures of the beautiful coral that's all around them. Using Cat's drawings as a map, they swim to get Tony back home. Along the way they meet little polyps that live in the coral and learn that they actually helped to make it! They learn about how long it takes to make and how delicate it is. Luckily they soon find Tony's family and they're reunited. Back home Nick and Sally make their own coral drawings, cause you never know when the Cat might need help again!

When Sally accidentally destroys Nick's model of a mountain, the Cat takes them to meet Sara of Serendip, an inventor who helps them understand that you can make new discoveries through your mistakes.Nick discovers that Sally can't hear him when he yells from his bedroom window if their bedroom windows are closed. The Cat takes them to the Soundy Sea and they learn that sound travels in waves.

Bounce - Nick and Sally are wondering why their ball is so bouncy. Fish tells them it's because it's made from rubber, and rubber comes from trees. Cat doesn't believe him so it's time to ask the expert, Dr. Twiggles! It turns out Fish is right! And Dr. Twiggles shows them all just how rubber is made, and all the wonderful things rubber can make!Timmy Tippy Toe - Nick and Sally are playing on a climbing frame but just can't manage to get to the top. Cat tries to show them how it's done but he can't do it either! Time to go see Timmy Tippy Toe, the Klipspringer who is an expert climber! Timmy teaches them to use their hands and their feet, and now they can reach the top of their own "mountain"!

Name That Sound - Sally and Nick are trying to stump each other by guessing the animal sounds they're making. But the Cat stumps them both when he tries to make the sound of a cricket! That didn't sound like a cricket. They all try but just can't figure out how a cricket makes its noise. Well Cat's friend Clarence the Cricket can surely show them! Off to the Grassy-Grove-Dell to meet him! He shows him his wings, one that is comb-like, the other a scraper, when he rubs them together, he makes his wonderful cricket noise. Back at home Nick and Sally find things around the house they can use to mimic Clarence - a deck of cards and a comb!Fabulous Feathers - Sally is playing dressup, but her favourite hat no longer has any feathers on it. Where can they find more? The Cat's good friend Puranjay might be able to help! He's a peacock who lives in Feathery Flats, he has plenty of feathers! Sally collects the feathers that have fallen out of Puranjay and discover that each one has it's own distinct job. But it's his tail feathers that are just jazzy and snazzy enough for her hat! They are the most fabulous feathers!

When Nick and Sally's boat sinks, they need to build another boat, but don't know how. A trip to Floating Island helps them discover that, along with needing the right material, you also need to make the shape of your boat float.Nick is in pursuit of finding out how to build a drawbridge. In Spansylvania, they meet a dragon who chases after them - and along the way they find out that some materials are better suited for bridges than others.

Meet the Beetles - Nick and Sally must protect their cookie jar from cookie snatchers! But how? Well by meeting three of the Cat's beetle friends, that's how! Stan the Giant Stag beetle shows them how to look scary, while Cliff the Click beetle teaches them to make a noise them jump! And Bobbi the Bombardier beetle has a stinky surprise for those that try to sneak up on her. Now Nick and Sally can keep their cookies safe!Tongue Tied - Mmm, there's nothing better than a blueberry popsicle, even though it makes your tongue blue! Speaking of tongues, the Cat has some friends with marvelous tongues! The kids meet Treetop Tom and see how his tough tongue can pick food off of thorny branches. Then Snifty the boa snake shows them how she uses her tongue to smell. And by using Cat's "Not-So-Fast-Glasses", they can see Colin the chameleon's lightening fast tongue get him his food. Nick and Sally realize that their tongues are pretty useful too.. for asking for another popsicle!

Manatees and Mermaids - Sally and Nick are pretending to swim, but why not go for a real swim asks the Cat! Off to the Glippydrippy Gulf to meet Matilda the Manatee and her son Marlin. Matilda and Marlon teach their guests how to swim slowly and gracefully. Until they hear the sound of a boat motor! Those can be dangerous for manatees, but luckily the Cat, Nick and Sally help their new friends to stay safe. And when they get back home, Nick and Sally will be sure to tell everyone to "Slow down for manatees!"The Last Chocolate - Only two chocolates left in the whole box, what a great present for Nick and Sally's Moms. That is until The Cat excitedly eats them! Oh no! How are they going to find more chocolate to give to their moms? Why a trip to visit Princess Lottachoca in the Cocoalicious Forest will help them! There, the Princess teaches Nick and Sally the chocolate-making song and they help to pick the beans, roast them, and to heat the juice and add sugar. And then, pouring the hot liquid into moulds of any shape. Now that the chocolate has cooled, it's time to go home and surprise their moms! Educational Objective: The process of how chocolate is made from the humble cocoa bean - by picking the beans, drying them, roasting them and then crushing them to get the juice, then adding sugar while you heat it, pour it into a mould and cool it.

Babies - Sally is looking after some baby hamsters, but how can she and Nick hold them right? Well, different animals hold their babies different ways. A trip to Ozzie-Wozz Outback will help them, Cat has some friends who know all about carrying babies! First up is Wilma the spider, who carries all her babies on her back. Then it's off to see Dilly the crocodile, she carries her babies in her mouth! And the last stop, Coco the Koala who uses a pouch to carry her little one. But how does that help Nick and Sally? Well all the babies were happiest with their moms, so they'll just leave them all together.Fast - It's a race to the treehouse, but Nick and Sally wish they could go as fast as an airplane! How about a peregrine? asks The Cat. What's that? The fastest creature in the world! His friend Perry the Peregrine Falcon will show them how fast he can be. Off to Steep-and-Deep Cliffs to meet him! Using Cat's special backpacks, the kids have wings like Perry's so they can fly through the air too. Perry shows them how he dives straight down to catch his food. Who wants to be as fast as an airplane, when you can be a peregrine falcon!

Nick and Sally need a strong piece of string to pull their train, but it breaks, and they don't have anything stronger in their craft box. The Cat takes them away, but the Thinga-ma-jigger malfunctions and they have to make an unscheduled landing. It turns out they've shrunken and are inside the craft box, where they discover that they can create a stronger string by braiding several strands together.Nick and Sally are in the treehouse making funny faces at themselves in the mirror when they notice a bird flying back and forth into the tree branches. They discover that the bird is building a nest and they want to get a closer look but can't do it without disturbing the birds. The Cat takes them to a mirror world where they learn how reflections work and they concoct a kind of periscope that allows them to watch the bird without disturbing it.

When Nick's magic trick causes his toy car to disappear under the porch, the Cat takes them to Arcade Island to win a Grasper-ma-clasper. Instead, they find out the magic of bumping things around.The kids want to make a great snowman but the clothes they've chosen are frozen in the ice and snow. Cat takes them to Coldsnap Island, where they discover that when they warm up ice or snow it becomes water.

The kids need to move a big rock in their backyard so they can plant an apple tree. The Cat takes them to Machine-a-Ma-Zoo, where they learn how a lever can solve their problem.Sally is playing a song on an instrument made up of different things in the Treehouse but she can't find the right note for her song. In Gongolia, they find out that bigger things make lower sounds and smaller things make higher sounds.

The kids want to get a trunk up into the treehouse and go to the Machine-a-Ma-Zoo, where they're introduced to simple machines, and learn about the pulley.Sally loses her "slidiness" and when they go to the Frictionarium, they find out that there's a force called friction that can stop a person from sliding.

Nick and Sally are having a sleepover in the treehouse and Nick is startled by a shadow. The Cat explains that shadows aren't scary if you know what they are. He takes them to Silhouette Valley where they learn that shadows are made by blocking light and the position of the light can make shadows grow or shrink.Nick unintentionally loses Sally's bouncy ball. They go to Ballaballo and learn how different balls are made of different materials, which help them move in different ways.

Sally is trying to make a vase for her mother but each one she tries falls over. Cat takes the kids to Blueprintia where designs become real. They discover what they can learn by designing before building, which helps Sally make the vase back at home.The kids are creating a game that involves "fishing" for prizes, but they can't "catch" any of the prizes. The Cat takes them to Arcade Island where they discover what will and won't be attracted to a magnet.

When Nick's magic trick causes his toy car to disappear under the porch, the Cat takes them to Arcade Island to win a Grasper-ma-clasper. Instead, they find out the magic of bumping things around.The kids want to make a great snowman but the clothes they've chosen are frozen in the ice and snow. Cat takes them to Coldsnap Island, where they discover that when they warm up ice or snow it becomes water.

Nick gets some new train cars for his train set and wants to add them to his train, but the magnets won't connect. The Cat takes them to the Magnetic Fields where they learn how magnets work.Nick is trying to learn how to ride his bike so the Cat takes him and Sally to Balence Point, where he discovers the things to keep in mind when trying to maintain your balance.