In a city of monsters with no humans called Monstropolis centers around Monsters, Inc., the city's power company. Monsters, Inc. The lovable confidant, tough large, furry blue behemoth-like giant monster named James P. Sullivan (A.K.A. better known as Sulley)(John Goodman) and his Cyclops wisecracking best friend short, green monster with one large eye, Mike Wazowski(Billy Crystal) discover what happens when the real world interacts with theirs in the form of a 2-year-old baby girl dubbed "Boo,"(Mary Gibbs) who accidentally sneaks into the monster world with Sulley one night. And now it's up to Sulley and Mike to send Boo back in her door before anybody and especially two evil villains such as Sulley's main rival as a scarer chameleon-like Randall(a monster that Boo is very afraid of)(Steve Buscemi), who possesses the ability to change the color of his skin and Mike and Sulley's boss Mr. Waternoose(James Coburn) the chairman and chief executive officer of Monsters, Inc.