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Plot Outline
Monsters generate their city's power by scaring children, but they are terribly afraid themselves of being contaminated by children, so when one enters Monstropolis, top scarer Sulley find his world disrupted. James P. Sullivan (AKA "Sulley") and Mike Wazowski pick up their paychecks at Monsters Inc., the utility company that generates energy from the goose bumps of children. Sulley, the No. 1 scream-generator at the plant accidentally lets in a little girl into the monster world. Since monsters are actually terrified of children it's a major cause for alarm and a major headache for Sulley and Mike.