Commander Ed Straker has to make a split-second decision when a lunar module, captained by Frank Craig (David Summer) and with Paul Foster (Michael Billington) aboard, is endangered by an attacking U.F.O. The two men afterwards accuse him of putting them in even greater danger by ordering re-entry at an impossible angle.

While driving home, Interceptor pilot James Regan and his wife stop for a cat in the road and are abducted by the Aliens. Regan is left behind, and is now being controlled by an Alien mind in the cat. In his Interceptor, Regan is controlled to let a UFO escape and finally places his vehicle on a collision course with Moonbase!