Caillou (translated pebble or stone in French and nicknamed The Prince of Imagination) is thebr br title character of the show. Caillou was first voiced by Bryn McAuley from 1997 through 2000,br br then Jaclyn Linetsky in 2000 through 2003, and then, due to Jaclyn Linetsky's death, Anniebr br Bovaird from 2003 through 2009. Caillou was first shown in the episode "Caillou Makes Cookies",br br which aired in 1997.br br Caillou is an average, imaginative four-year-old boy with a love for forms of transportivebr br machinery such as rocket ships and airplanes. A dreamer, Caillou is prone to frequent dreambr br sequences in some episodes visualizing his daydreams and hopes, and many episodes chronicle hisbr br normal daily experiences with his parents, friends, and neighbors. Caillou particularly lovesbr br his stuffed dinosaur Rexy and teddy bear Teddy, along with his pet cat Gilbert, all of whom arebr br depicted as puppets in segments featured in the earlier episodes.br br Entertaining misadventures of a four year old boy named Caillou, where each day he discoversbr br something new and interesting with his mommy, daddy, and Rosie. Between Caillou segments arebr br segments featuring Caillou's pet cat Gilbert, Caillou's teddy bear, Teddy, and Caillou's toybr br dinosaur, Rexy, in puppet form. The show deals with issues like fear of the dark, patience,br br being a good friend, being a good sibling, and other important facts of life.