All those stories, about monsters under the bed and in the wardrobe, they are all true.

Since the very first bedtime, all around the world children have known that once their mothers and fathers tuck them in and shut off the light, that there are monsters hiding in there wardrobe, waiting to emerge.

But what they don’t know is, it is nothing personal it’s just their job. With a decidedly different kind of work force Monsters Incorporated is the largest scare factory in the monster world. Monsters, Inc. is working 24 hours a day and 365 days a year all over the world, collecting and refining human screams into clean, dependable energy. We scare because we care.

James P Sullivan AKA Sulley is one of the top Scarers. Sulley is a huge, intimidating monster with blue fur, large purple spots and horns. His Scare Assistant, best friend and roommate is Mike Wazowski, a green, opinionated, feisty little one-eyed monster. Like a hard-driving coach, Mike is tenacious in helping keep Sullivan in top scaring form.

The cast of characters also includes the factory’s CEO, a crab-like monster named Henry J. Waternoose, the snake-headed, beguiling receptionist Celia and the paperwork loving, slug-like dispatch manager Roz. Sulley’s main rival for the top Scarer position is a sarcastic chameleon monster named Randall Boggs.

But one night after work, Sulley accidentally lets in a little human girl named Boo and his life is turned upside down. Everything he believes in and has worked so hard to achieve is suddenly in jeopardy. Human children are considered toxic in the monster world, and letting a child into this world is considered a serious crime. Needless to say, Sulley is desperate to return the child to her home before she wreaks havoc throughout Monstropolis. Mike is adamant about getting the child out of Monstropolis before she jeopardizes their way of life.

But a funny thing happens as Sulley tries to get rid of his little mistake he actually starts to care about her. As Sullivan takes bigger and bigger risks to ensure the girl's safety, he begins to question whether scaring kids is really what he wants to do with his life.