Caillou is an imaginative four-year-old boy with a love for forms of transportive machinery such as rocket ships and airplanes. A dreamer, Caillou is prone to frequent dream sequences in some episodes, visualizing his daydreams and hopes, and many episodes chronicle his normal daily experiences with his parents, friends, and neighbours. Caillou particularly loves his stuffed dinosaur, Rexy, and teddy bear, Teddy, along with his pet cat Gilbert, all of whom are depicted as puppets in segments featured in the earlier episodes.