Caillou faces his fear of a waterslide; Caillou pretends to go sailing; Caillou teaches Rosie to like bugs after learning about them at his playschool. "Caillou and the Big Slide" - At playschool, Caillou pretends to be a mountain-climber. It comes time for a trip to the pool. There are swings there and Caillou and his friends enjoy swinging on them. Then, their teacher Ms. Martin introduces them to Mary, the lifeguard. Leo calls Caillou to come try the waterslide. Caillou comes over, but seems a bit scared by it. He climbs up the ladder, but then climbs back down. Ms. Martin tells him that there was a time when she was afraid of swinging on the swings. She suggests that he give it another try. Caillou imagines that he is rafting down a mountain. He gives it a go and finds that he enjoys the waterslide. "Caillou the Sailor" - Mommy and Daddy are all dressed up and going out for a party. They tell Caillou and Rosie that Grandpa coming over to babysit and bringing a surprise. Grandpa arrives, carrying a bag. However, when Caillou asks what's in it, Grandpa quips that it's his dirty socks and asks Caillou if he can wash them. Caillou calls him on this and he admits that it is the surprise --- a book about ships and sailing and a small telescope. Caillou has fun looking through the telescope, but Rosie has trouble closing just one eye to look through it. Grandpa reads a story from the book and suggests that Caillou and Rosie can be his crew. There's a storm outside, but Grandpa works the sound of the thunder into the game. Rosie starts to get tired and Grandpa puts her to bed. Caillou fantasizes about being the captain of a ship. Mommy and Daddy arrive home and Caillou shows Daddy the telescope. Grandpa then puts Caillou to bed and "Captain" Caillou says that he's not afraid of thunder anymore. "Caillou and the Creepy Crawlies" - Caillou and Rosie are playing in the living room and Gilbert is there, too. He spots a spider and starts playing with it. Rosie notic