At a remote US Air Force radar station in the Arctic, the lone airman/engineer on duty is surprised by the arrival of a group of people, and lets them in. Our hero eventually realises that they are the advance party of an alien invasion force, when one of them partly removes their human mask/body suit, revealing an intense light within. The aliens try to stop him from warning his superiors, and he manages to barricade himself into a room. He taps out a Morse code message using wires from some equipment, which is received by two other airmen at another Air Force station. When one of the airmen interprets the message, it is a request for an immediate nuclear strike on the Arctic radar station. They ignore it, and the movie ends.