Set in Monstropolis, a thriving company town where monsters of all shapes and sizes reside, the film follows the hilarious misadventures of James P. Sullivan (known to all as "Sulley") and his best friend, roommate, and coworker, Mike Wazowski. Both work at Monsters, Inc., the largest scream processing factory in the monster world, where Sulley is the top kid Scarer and Mike is his enthusiastic Scare Assistant. The main power source in the monster world is the collected screams of human children. At Monsters, Inc., an elite team of Scarers is responsible for gathering those precious natural resources. Complicating matters is the fact that monsters believe human children to be toxic and direct contact with them is forbidden. When a little girl (named Boo) accidentally follows Sulley back into his world, he finds his career in jeopardy and his life in utter chaos. Assisted by Mike, he schemes to rectify his mistake but the trio becomes caught up in a series of complications and unexpected intrigue beyond their wildest dreams.