Caillou (French pronunciation: ​[kaˈju]) is a Canadian educational children's television series that was first shown on Teletoon (both English and French versions), with its first episode airing on the former channel on September 15, 1997; the show later moved to Treehouse TV, with its final episode being shown on that channel on October 3, 2010. The show was animated in Canada by CINAR Corporation (later Cookie Jar Entertainment), In season 5, the show was animated by South African-based studio, Clockwork Zoo.[3] The show, based on the books by Hélène Desputeaux,[1][2] focuses on a four-year-old boy named Caillou who is fascinated by the world around him.