Monsters, Inc. is the largest scare factory in the monster world and the top Kid-Scarer is James P. Sullivan (John Goodman), a huge, intimidating monster with blue fur, large purple spots and horns, known as "Sulley" to his friends. His Scare Assistant, best friend and roommate is Mike Wazowski (Billy Crystal), a lime green, opinionated, feisty monster. And visiting from the human world is Boo, a tiny girl who turns the monster world upside down and teaches Sulley and Mike that laughter is more powerful than a scream.