When a lonely physics professor realizes the sun is going to burn out, he knows that he and humanity have only a few hours to live. In that time, Stan resolves to make up for lost years. He courts and proposes to Leslie, a woman he has known for two years but never dated. Leslie, although puzzled, finds herself more and more entranced by Stan until she finds out the reason for Stan's sudden attention.

While expecting a shipment of missiles, the militia receive a sealed cargo and messenger refusing to reveal what the deadly cargo is. Shortly afterward, an alien life-form begins a series of chilling attacks.