In the bustling city of Monsteropolis, James P. Sullivan, (or Sulley to his friends), is at the top of his game. He works with his best friend, Mike Wazowski, at Monsters, Inc.--a company that generates clean, efficient energy from the screams of children. It's dangerous work though, for as all monsters know human children are toxic and can kill a monster with a single touch. Sulley's on his way to the top as the company's best Scarer until he accidentally lets a tiny little girl into the monster world...