The Cold War has endured for a century and an uneasy peace between Us and Them exists. A secret agent arrives in America from Moscow with the story that humanoid robots have been developed by Them and have been infiltrated into America. When they get together, they will trigger a total conversion bomb. Research is started to duplicate the humanoid robot and detect the invaders. Almost too late, the head of the Bureau of Robotics realises that the agent is in fact one of the humanoid robots and destroys it.