The Enterprise is taken over by Crewman Norman, who turns out to be an android in disguise. He sets the ship on a course back to his home world, a planet populated entirely by androids - and one Harry Mudd, trapped there after a crash-landing. The androids plan to move out beyond their own planet to populate the galaxy with more of their logical, efficient kind, and the Enterprise is their chosen means of transport. Kirk, although understandably suspicious of Harry, must now cooperate with the con-man if the android invasion is to be stopped. And the greatest weapon at the disposal of Kirk, his crew, and Harry is total illogic.
