Nick and Sally are trying to jump high enough to touch the moon, but "what goes up must come down" says the Cat. That's gravity! And to show them just what gravity is, that means a trip to the moon! That's where they meet Astronaut Audrey who takes them for a space walk to learn all about gravity.

Sally and Nick are playing hide and seek, but Nick keeps sneezing! How can they stop it from happening? Good thing Cat's friend Cluey Looey will be able to help them! At Muddyfeet Waterhole they discover that Louie is having the same problem! Nothing a trip inside Louie's nose can't solve! Inside a super shrunken Thingamajigger, Nick, Sally and Cat discover what causes sneezing and what they can do to avoid it from happening!

Nick keeps trying to surprise Sally, but he just can't do it! The Cat takes them to find a real surprise in the Skippylarito Fields! Once there, Cat shows them a special bean - that suddenly moves! With a shrunken Thingamajigger, they go inside the bean and meet the moth larvae that lives there. They learn that it's really the moth that causes the bean to move. What a neat surprise indeed!

The kids hear chirping but can't find where it's coming from. If only they had better ears. Ears like an elephant? Or maybe an owl or even a fox? Not a problem when the Cat's around! He takes them to meet these animals with amazing ears. Back home the kids used what they learned from their new friends to find the sound — a teeny tiny cricket! What other great sounds are around?

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!

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"!

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.

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!

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!

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!

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!"

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!

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!

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!

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 OzzieWozz 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.

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!

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!

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!

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 comblike, 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!

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!