When an android takes control of the Enterprise, Kirk and his crew spend four days traveling at warp speed to an uncharted planet. When they beam down they find none other that Harry Mudd, the apparent ruler of the planet made up entirely of androids. It turns out there is one major problem with Harry's idyllic existence: the androids who serve him hand and foot simply won't allow him to leave. Kirk and Spock devise a way to disable the androids but have their own special plans for Harry.