Monsters, Inc. stars Sulley and Mike. Sully is a huge, blue, furry beast and Mike is a small, green, one-eyed monster. The two live in Monster world, an alternate dimension where people are monsters. They work for a company, Monsters, Inc., and it's their job to collect children's screams. This is accomplished by going through doors, which act as a dimensional gate to the human world. Screams are collected in storage tanks and act as power for the city, the way electricity powers our world.