Caillou and his friends clean up the playshcool's playground and then decide to build a road; Caillou helps a family to build their new home; Caillou visits a skyscraper for the first time. "Caillou the Road Builder" - It's nighttime and there's a rather loud thunderstorm. Rosie is scared, but Caillou helps to comfort her. The next morning, Mommy drives Caillou to the playschool, but finds a tree blocking the route they normally take. This old oak tree is a familiar landmark, but got blown down by the storm. Caillou's going to miss the tree and so will Mommy. She tells him, however, that a new one will be planted and reminds him that trees are special and it's important to take care of them. For the time being, they take a detour to get to the school. At school, Ms. Martin has the kids help to clean up the mess on the playground from the storm. Caillou, Leo and Clementine then decide to create a road in the sandbox heading over to the swings. The road even crosses some of the puddles made by the storm. Caillou imagines that they're driving bulldozers. They even make a bridge. Just then, Clementine puts a small sapling in the way, saying it's a big old tree. Leo says that Caillou should knock it over, but Caillou remembers what his Mommy said about trees. So he has them make a detour instead. "Caillou's Building Adventure" - In the kitchen, Caillou's parents and his Grandpa are making jam sandwiches. They're going to be helping a family to build their new home. Caillou wants to come along and help, but Daddy and Grandpa aren't sure. Mommy suggests that maybe he just make a quick visit. She'll drop Rosie off at Grandma's and then drop Caillou off at the construction site. Once there, Daddy reminds Caillou that it can be dangerous, so he'll need to be careful. He introduces him to Sam --- the father of the family that'll be living there. Caillou imagines being a home builder and putting a home together in a flash. He then meets Sam's son, Franky. They leave handp