Gilbert is one of the main characters who appears in the children TV series Caillou. He is Caillou's pet cat and Rexy and Teddy's best friends. He has gray fur and a blue spot over one of his eyes, it feels like Storm. He has been on the show since Season 1, he likes playing with Sarah's cat Olly. Gilbert also appears in the puppet segments of the show, too. In the puppet segments he talks but in the regular episodes he does not. Gilbert likes playing with Sarah's cat Olly. He hates the bulldog in the neighborhood.
In the Season 1 episode, "Caillou is Afraid of the Dark", Gilbert is hiding underneath a paper bag because he got stuck in it. In "Caillou's new member of the family" in season 1, Caillou, Rosie and Mommy are looking at old picture. They saw one when Gilbert was a kitten and Caillou remembers when the family got Gilbert.
He is voiced by Bob Stutt who also voiced Molly and Snicklefritz.