Monsters, Inc. is a 2001 American computer-animated film and the fourth feature-length film produced by Pixar Animation Studios. It was directed by Pete Docter, co-directed by Lee Unkrich and David Silverman, and written by Jill Culton, Peter Docter, Ralph Eggleston, Dan Gerson, Jeff Pidgeon, Rhett Reese, Jonathan Roberts, and Andrew Stanton. The starring voices are John Goodman and Billy Crystal as monsters who scare children for a living, Mary Gibbs as a little girl who enters the monster world, Steve Buscemi as a rival monster, and James Coburn as a monster businessman. John Goodman as James P. "Sulley" Sullivan, a large furry blue monster with horns and purple spots. Even though he excels at scaring children, he is kind-hearted and thoughtful by nature. Billy Crystal as Michael "Mike" Wazowski, a green creature with a ball-shaped body, a single large eyeball, and skinny arms and legs. He runs Sulley's station on the scare floor, and they are close friends. Mike has an outgoing personality and is dating Celia Mae. He makes cameo appearances in Finding Nemo, Cars, WALL-E and Toy Story 3.