Caillou and his friends Jason and Jeffrey make finger puppets at playschool and decide to put on a puppet show for the rest of the class the next day. In the park Caillou starts a new hobby ...

this is far from the only time that they have brought Caillou into it. The first major appearance was from the Season 19 episode, “Stewie’s First Word” that had Lois wondering where Stewie ...