In this adventure from the British science fiction series, Doctor Who (William Hartnell) and his time machine materialize in 1966 London. Sensing evil in the air, the Doctor poses as a scientist to ferret out the source and stumbles on the thinking computer WOTAN. Though poised to be linked with computers around the world to create an advanced computer network, WOTAN has its own plans: namely, to create a robot army to take over the world.