Caillou pretends to be a race car driver, not realizing the trouble he's causing.

Caillou wants to play, but everybody's too busy to play with him. Caillou's Mom has to do the taxes, Caillou's Dad is repairing the washing machine, and Caillou's grandma is tucking Rosie in for her nap. Even Gilbert doesn't seem to want to play. Caillou then goes back into his room and plays with his plush toys.

Caillou's friend Clementine comes over to play. Clementine wants to play Family but Caillou gets upset because he wants to play dinosaurs & Clementine is playing with his teddy bear & stuffed bunny without his permission. After Caillou gets upset his mom calms everyone down & has both Caillou & Clementine apologize to one another. Clementine's brother Billy then comes over to play baseball with everyone.

Caillou and Rosie are playing together. Then Mom comes in and tells them to clean up their toys. But Caillou sees Rosie still playing and asks why she's not cleaning up. Mom tries to get Rosie to clean up and at first she does, but then she starts playing again. Mom explains that she's still too little, but Caillou won't have it and decides he's too little too. He asks for milk in a training cup like Rosie and his sandwich in little pieces and a bib. Then, Caillou and Rosie play baby together until Mom appears and stops them both for a nap! Caillou goes along at first, but then gets up. He tells Mom that he wants to be four again.

Caillou meets his baby sister, Rosie. He either likes Rosie or doesn't like Rosie.

Caillou's hiding in a pile of plush toys when his mom comes in and calls him to eat chocolate pudding. Now, if it's one thing Caillou really likes, it's chocolate pudding, so he comes out of hiding. On his way downstairs, he's made to tidy up the mess on the stairs. Then, just as he's about to eat the pudding, he's called outside to tidy up the mess he's made on the porch. And then, just as he's back at the table, he's called into the bathroom to tidy up another mess. Finally, he has his chocolate pudding. Caillou's Dad suggests that he do something about all his old toys. Caillou decides to give some to Rosie, and his Dad suggests that they make a toy chest after eating. Scene cuts to when the chest is finished. We see the lid close, and a picture of Caillou's face is on the lid.

Caillou carries a large stack of clothing into the laundry room where his mom is doing the laundry. He decides to have a little fun and plays dress-up with his dad's clothes. His mom thinks it's funny, so she takes a picture of him together with his dad.

Caillou visits the zoo, sees a rhino and her young, a group of chimps of which one looks like Caillou's grandpa and another looks like Caillou, and a sea otter who's being taught to swim because it lost it's mother. The end.

Caillou and the family go to a theme park. Caillou rides a water ride with his Dad and the whole family stops for cotton candy. They all ride the ferris wheel. Then Caillou notices a ringtoss game with a huge bear as a prize. Caillou's Dad plays and wins the bear.

Andre's coming over to play soccer with Caillou. Problem is, Caillou has the proverbial stool foot. He fails to kick the ball, and decides that he doesn't want to play anymore. He gets reminded of the time he learned to skate. He gives it one more go, and successfully kicks the ball. The end.

Caillou is afraid of Mr. Hinkle, and when Mr. Hinkle waved to Caillou, Caillou panicked and ran. That made Mr. Hinkle really sad, so he goes over and apologizes. Caillou's Mom couldn't get Caillou to go downstairs, so they engage Caillou in a game of "Hide and Seek". In the end, Caillou is no longer afraid of Mr. Hinkle. As a matter of fact, Caillou decides that he likes Mr. Hinkle after all.

When Caillou's parents are busy working on the walls and Rosie is sleeping, he decides to play with Gilbert. But Gilbert has a totally different idea of games. Caillou's parents explain this to him, and they are surprised to see two "cats" playing together nicely.

Caillou and Daddy are in the garden and Caillou notices a dead bird on the ground. Caillou asks if it's dead and Dad affirms. He suggests burying it and Caillou agrees. They bury the bird and Caillou asks Dad point-blank why the bird died. Dad says that it's a tough question and the narrator interjects that Caillou didn't think that it was such a tough question. Dad decides that it's for the best not to tell Caillou about the bird's unfortunate run-in with Gilbert and says that the bird died because it was too old. Caillou accepts this, but seems troubled. Throughout his day, Caillou hears a number of people comment about how old they are. Dad has trouble reading the paper and comments that he must need glasses- he's getting old. Sarah got in-line skates for her birthday- she's a whole year older. When Daddy is tucking Caillou into bed that night, he says that Caillou is getting bigger and older every day. Caillou breaks down. He explains his concern about he bird and Dad tells him tha

Scene opens with Caillou watching his mommy put on make-up. She has to go out for a while, and Julie will be there any minute. Julie arrives. She feeds Rosie lunch and then go make Rosie take a nap. She asks Caillou to go play by himself for a while. Caillou chances upon Rosie's doll, and decides to apply mommy's make up onto it. Suddenly, Rosie calls out for Julie. She can't sleep without her doll. Caillou tries to hide the doll with the make-up, but Julie finds it anyway. Caillou's mom returns. Caillou breaks down and confesses. He just wanted the doll to look pretty like his mommy. They try to clean it up. And dispite failing to completely remove the stains completely, Rosie still likes the doll. The end.

Caillou is drumming and singing badly. Mom tells Caillou to quiet down so Rosie can take a nap, but he doesn't want to at first. Eventually he stops and heads off to the kitchen to get some cookies. They're hard to reach though, so he tries to use a stool and ends up spilling the cookies as well as a jar of honey. He tries to make honey cookies, but ends up making a mess. Mom comes in and decides that rather than get upset about it, she'll just have Caillou help her clean up. He does and then he and Mom make cookies together. Sometime at the park, apparently later that day, Caillou and Mom share the cookies with Dad and Rosie. Then Caillou runs off and starts covering himself with mud. Dad asks him what he's making and he answers "a big mess."

Caillou's reluctant to take a bath at first, fearing such "possibilities" as falling down the drain. He is able to get into the tub, though. In there, he creates quite a mess with the water.

Caillou goes round the block, plays in the sprinklers, plays hopscotch, holds a ladybug and nearly gets lost, but manages to get home with the help of a neighbour.

Caillou's parents are going out, and Grandma's coming over to babysit. Later, it's naptime, and he dozes off. Until Glibert comes and wakes him up. Then he has trouble going back to sleep because it's too bright. Grandma comes up with an idea - a cardboard cutout of the night sky, and Caillou eventually falls asleep.

Caillou plays dinosaur hunter with Gilbert and then his Dad stops him for a snack. When he comes back, Gilbert's gone and he gets upset as he specifically told Gilbert to stay. He looks all around and Mommy notes that he's probably sleeping in a bedroom. Mom helps Caillou to play detective. They eventually find Gilbert under Caillou's bedsheets.

Caillou's grandma is watching Rover again. Caillou takes Rover out for a walk. Rover is a very obedient dog. When they reached the park, Caillou plays with Rover a bit. Caillou then decides that he wants a pet dog. But they already have Gilbert. SO, Caillou attaches a leash to his plush dog and pretends to walk it. The end.

Caillou has important stuff to tell Mommy. Rosie tore up a book and he drew her a picture and wants to show it to her. Every time he tries to speak to her though, he's interrupted by the ringing of the telephone and Mom's forced to ignore him. Then a call comes in and Mom hands the phone over to Caillou. It's Grandma. She comes over with a dog she regularly dogsits, Rover. When the phone rings, Rover goes nuts and Caillou discovers that he and Rover have something in common.

Caillou's sleeping over at Leo's place. He nearly forgot Teddy, but then remembers just in the nick of time. At Leo's place, Caillou has lots of fun, but got homesick when dinnertime arrives. By bedtime, Caillou wants to go home, but after a phone call to Mommy, Caillou decides to sleep over after all. The end.

Leo tags along with Caillou and his family on a picnic. They play Knights and Dragons, have the picnic lunch, and play some more. Suddenly, thunder can be heard. Caillou and Leo pretends that it's a dragon's roar. Rosie's beginning to fret because of thunder, but Caillou and Leo pledges to protect Rosie. It then starts to rain, so they quicklly pack up and run for the nearest cave. They then proceed to keep Rosie occupied so that she ignores the thunder. The rain finally stops, and they all head home. The end.

It's Caillou's birthday, and he's hoping for a particular special dinosaur. His grandma gives him a present. He opens it. It's a t-shirt with a picture of the special dinosaur on it, but no special dinosaur. Caillou's upset by it. The guests arrive, and so the play some games. Then it's time to blow out the candles on the cake. Caillou holds his breath as he makes his wish, then he blows the candles out. Then he has the cake. Caillou's mom then gives him another box. It's the special dinosaur!. Later, Rosie spills ice cream on Caillou's clothes. Caillou then puts on the special dinosaur T-Shirt that grandma gave him.

Caillou's grandma gets only junk mail in her mailbox, so Caillou decides to write a letter to her to make her feel better. When she sees the letter, she's in for a surprise.