Free-minded monsters Mike Wazowski and James P. Sullivan are training at a private training facility owned by Henry J. Waternoose to became top scarers. Only when they are top scarers they can scare real children, otherwise they may hurt themselves because it is believed that children are very toxic to monsters. That is why Mike and Sulley are training in a controlled environment where children are replaced by harmless robots.

Free-minded monsters Mike Wazowski and James P. Sullivan are training at a private training facility owned by Henry J. Waternoose to became top scarers. Only when they are top scarers they can scare real children, otherwise they may hurt themselves because it is believed that children are very toxic to monsters. That is why Mike and Sulley are training in a controlled environment where children are replaced by harmless robots.