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'''Henry J. Waternoose''', or simply known as '''Mr. Waternoose''' or '''Waternoose''', is the
hidden main antagonist of ''Monsters, Inc.'' He is the former CEO of the company and Sulley and Mike's former boss who was driven to villainy out of his own desire to keep his company running. He at first appears to be a mentor, father figure, and good friend of theirs, but in actuality he is the true mastermind behind the plot to kidnap Boo and use the scream extractor on her and [[Randall Boggs|Randall]] (the character who at first appears to be the main antagonist) was actually working for him all along.