Rex is one of the supporting characters in the Disney/Pixar Toy Story films. He is a green plastic tyrannosaurus rex. He had a supporting role in the first film and a much larger one in Toy Story 2 and Toy Story 3. He also makes a cameo in the 2001 film Monsters, Inc. during the end credits. He is also the titular protagonist of theToy Story Toons short Partysaurus Rex, and serves as a major character in Toy Story That Time Forgot.