Caillou is having fun being noisy, but his Mommy asks him to be quiet. All of a sudden he feels hungry, so he goes off to the kitchen -- where he gets the idea to make some cookies. Only instead of making cookies, he makes a great big gooey, sweet and delicious mess!
Caillou is afraid. He’s afraid of Mr. Hinkle, the kind man who lives next door. He is even afraid of Mr. Hinkle’s house! So when Mr. Hinkle comes to visit to say how sorry he is that Caillou is afraid, Caillou runs away. But it quickly turns into a game of hide and seek and when playtime is over Caillou has made a new friend.
Caillou really hates vegetables until he goes for a walk in the park with his Grandpa, who shows him all kinds of interesting animals and birds. All this activity makes them hungry—as hungry as bears! So when it’s suppertime, they eat just like bears, pretending their vegetables are berries, (leaving just enough room for cookies, of course).
Mom is very busy with the household accounts so she doesn’t have time to play with Caillou. Nor does Dad, who’s trying to fix the washing machine. And Grandma’s busy looking after Rosie. Even Gilbert the cat doesn’t want to play with him. Caillou is all alone and feeling a bit sorry for himself. But pretty soon he invents a game with one of his dinosaurs and then he’s too busy to play with everyone else.
Caillou has left his toys all over the place: on the stairs, in the driveway and even in the bathroom. He has to tidy them all before he can have his chocolate pudding. Part of the problem is that he has so many toys. Mom suggests that he should give some of his old ones to Rosie and Dad suggests that he can make a big toy box. Caillou helps him to make it.
Just like his Daddy, Caillou loves anything to do with cars, so he’s very happy when Dad asks him to help wash the family car. And while he sits in the car, he imagines he’s driving a car to the beach. When he beeps the horn, he surprises Dad, making him accidentally turn the hose on himself. Later on, when the family really goes for a drive to the beach, Caillou is reminded of his imaginary journey.
It’s Caillou’s first day at day care and he really doesn’t want to go. But once he gets there he meets his teacher, Miss Martin and makes two new friends, Leo and Clementine. Day care is a fun place, after all and when his Mommy comes to pick him up, Caillou doesn’t want to go home!
Caillou gets up very early one morning and gets dressed all by himself. He doesn’t want to miss a trip to the circus. So when Dad points out that the circus trip is the following day, Caillou is very disappointed. In fact he’s not in a good mood at all. But Dad makes everything right by suggesting a special game: together, they create their own circus parade.
Caillou can’t get to sleep because he’s sure there’s a monster in his bedroom. Mom and Dad try to reassure him, but things go from bad to worse when he thinks his toy snake is real. Dad shows him that the scary noises he hears are being made by a tree branch brushing against the window and in the end, the only ‘monster’ in Caillou’s room is Gilbert the cat.
Caillou is talking to Grandma. She's surprised when he tells her he doesn't have any friends. She asks him about Clementine and Leo and reminds him that Gilbert is a friend too. And what about Rosie? Well yes, says Caillou, Rosie is my sister, but she's my friend too. And how about Mr. Hinkle? And Mom and Dad? Pretty soon, Caillou realizes he has lots of friends including Grandma.
Caillou needs a follow-up visit to the doctor for an earache. He is afraid to go in as the last visit frightened him. But his mother encourages him and the doctor assures him it won't hurt this time. Caillou examines a doll's ear first and thinks it's fun. Then the doctor looks in his. He's on the mend and onto a good thing. When he gets home he shines a flashlight in everyone's ear including Grandma who's snoozing in the armchair!
Caillou remembers when he was just two and a half and Rosie came home for the first time. Everybody was very excited—everybody except Caillou, who felt a bit left out. But that soon changed, especially when Caillou helped Daddy change Rosie’s diaper.
It’s a busy day. First of all it’s snowing and Caillou is looking forward to making a snowman. And Mom’s making one of her special surprise cakes, which means Caillou and Rosie have to go to the shop with her to get the ingredients. And then Caillou gets lost in the shop…but it all works out fine in the end. And the snowman is delicious!
It’s bath time. And for Caillou that means trouble. He just doesn’t like taking baths. But bit by bit bath time turns into playtime, thanks to Daddy, a motorboat and a big bottle of bubble bath.
Mom’s doing the laundry and Caillou decides to get dressed all by himself. The problem is, he doesn’t have any clean clothes to wear. So Daddy suggests a dressing-up game with some of his old clothes. Pretty soon Caillou is not only all dressed up he even has a moustache to go with his fancy outfit.
Caillou's favorite shirt has teddy bears all over it. It's his teddy shirt. One day he sees Rosie wearing it and he gets very upset. But he has to admit that he's getting too big for the teddy shirt. In fact, he can hardly get into it. But he doesn't really want Rosie to have it, so he gives it to his favorite teddy bear to wear.
Caillou has lots of big adventures when he goes round the block by himself for the first time. He meets Sarah out on her skateboard; he sees a rainbow; he plays hopscotch and he meets a scary crow. By the time he gets home he’s really happy to see Mom again.
Caillou is at Grandpa and Grandma's house. He goes looking for a special hiding place and gets stuck in a kitchen closet. Grandpa shows Caillou an extra-special place: a hollow tree trunk. Caillou discovers an old toy in the hiding place and learns that it used to be his Daddy's hiding place when he was Caillou's age.
It’s Caillou’s birthday and he’s having a little party. His friends Clementine and Leo come to play with him and they all have face paint disguises. What Caillou really wants for his birthday is a special dinosaur. And by the time the party’s over he unexpectedly has two of them!
Caillou has nobody to play with, so he recruits Gilbert his cat. He tries to get Gilbert to play his favorite games, but Gilbert isn’t interested in the slightest. When Mom points out that Caillou’s been trying to get the cat to play people games, he realizes that Gilbert probably wants to play kitty cat games. That works much better!
Caillou is tossing and turning. No matter what he does he just can’t get to sleep. It’s summer and his curtains are at the cleaners. Luckily Grandma has a wonderful idea: She makes a cardboard cutout night sky to put against the window. It darkens the room and projects the moon and the stars onto his walls and ceiling. Caillou falls asleep in no time.
One day in the park Caillou is scared by a stranger’s dog, so he’s very nervous when he visits Grandma’s house and discovers she’s looking after a friend’s dog. But bit by bit they get to know each other and pretty soon Caillou isn’t nervous at all. In fact he’s made a brand new friend.
Caillou and his family go to the zoo. Caillou is thrilled to see that animals have families too. He sees a baby rhino and a big family of chimpanzees. But his absolute favorite is a young sea otter, which has to be taught how to swim.
It’s a rainy day and Caillou is looking forward to jumping in all the puddles when he goes out with his Mommy. But somehow or other it takes Caillou a very long time to get ready to go out. There’s always something else he has to do before he can leave. So by the time he does leave, it has stopped raining. Happily, there are still some puddles to splash in.
Caillou and his family are spending the day at the beach. There’s so much to see and do! Caillou and Dad go into the water; a seagull tries to steal Caillou’s sandwich; Caillou sees a hermit crab and finally he and Dad build a sandcastle.
Caillou goes with Mom to buy a new pair of shoes. On the way he sees Sarah running fast. He decides he wants a pair of shoes he can run in. First, the salesman has to measure his feet. Eventually he picks exactly the right pair and he shows Sarah just how fast he can run.
Caillou wants to make a snowman, but he doesn’t really know how. Luckily, Sarah knows how to make snowmen very well and they work together building the components and putting them together. When they’re finished, Mom provides the finishing touches: A carrot for his nose and some big buttons for his eyes and his smile.
Caillou is very excited because he’s going to a parade with horses, drummers and clowns. But Rosie is afraid of clowns so Mom isn’t sure it’s a good idea to go. Caillou is upset because he thinks he’ll miss the parade just because of that. And then he has a good idea: If he shows Rosie that clowns are just people wearing silly costumes, she won’t be afraid anymore.
Caillou is having fun with his friend—his special friend—George. What makes George so special? Well, he’s invisible for one thing... George and Caillou have a race and break a flowerpot. At first Caillou blames George, but his Daddy talks to him and he agrees that he might have had a little something to do with it too.
It’s fall and the backyard is covered with leaves. Caillou and Rosie have so much fun playing in the leaves that Caillou doesn’t want to go into the house. He asks Dad if he can help him rake the leaves into piles. When they’ve made piles of piles, Caillou pretends the piles of leaves are houses enough houses to make a city.