He is initially much more reluctant towards Boo, and although he does not form as close a relationship with her as Sulley, he warms up to her and makes it possible for Sulley to find her again in the end of the film. He works as Sulley's scare assistant, providing closet doors for Sulley to enter and scare children, as well as collecting the scream containers he fills. His voice actor Billy Crystal claims that the character is a mix between Mr. Michael 'Mike' Wazowski, the film's second protagonist, is a Cyclops monster in the shape of a tennis ball, with one large eye, two horns on his head, and arms and legs, but no torso. Sulley also appears in the credits of the 2006 film Cars as a giant, horned, blue monster truck.

Company Play 'starring, written, directed, and produced by Mike Wazowski' and co-stars in the play. After the bloopers of the film, he announces the Monsters, Inc. His original names were Johnson and Mulligan. But Sulley takes over the company, and changes the focus from the collection of screams to laughter, which he has learned is many times more powerful than scream. When Waternoose is taken away, Monsters Inc. Sulley and Mike promptly destroy the door, banishing Randall as they were. At the end of this chase, Randall is overpowered and thrown into a closet in a swamp, where he is mistaken for an alligator and beaten with a shovel. The chase runs through the factory and through an entire network of doors between both the monster world and the human world. After Sulley saves Boo from Randall's scream machine, Waternoose orders Randall to retrieve her and eliminate Sulley. Sulley soon becomes attached and protective of his young human friend, which he makes clear to Mike.

When her presence becomes public knowledge, he hides her in his home, eventually coming to realize that she is not as dangerous as he has been led to believe. He attempts to return her to her room, but to no avail. During the course of events, Sulley accidentally allows a small girl, Boo, to enter the Monster World. When he is first seen, Sulley is the top scarer at Monsters, Inc., responsible for generating the screams that provide power for the city of Monstropolis along with his partner, Mike Wazowski. 'Sulley' Sullivan, the film's protagonist, is a large, furry blue monster with purple spots, voiced by John Goodman.

Monsters inc characters