Roz (voiced by Bob Peterson) is a slug-like monster who is the key master and administrator of Scare Floor F. Near the end of the film, she is revealed to be Number One of the Child Detection Agency (CDA), having been on an undercover assignment to investigate the company.

She also makes surprise appearances in three outtakes of the film, when Boo is in the toilet cubicle with Sulley, the CDA shaves and showers George Sanderson, and when Sulley proves to Boo that there is no one behind her bedroom door.

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