Some teenagers in an old house find that there's something evil in the water.

To escape his captors an industrial spy hijacks a space shuttle only to find the controls malfunctioning. Catapulting through outerspace, he sights alien battleships approaching earth. Many years later when the arc of his flight path returns him to earth, he discovers the planet is completely under alien domination, totally devastated by thermo-nuclear battles. Desperate and alone, he searches for any human existence. Finding a group of survivors, together they fight the aliens to save mankind.

Captain Glenn Edwards's plane crashes over the mysterious Amarok Crater. When the government covers up his disappearance, Glenn's fiancée, Samantha, assembles a ragtag team of misfits to find out what really happened. They are horrified to discover bizarre creatures created by the rays of a radioactive meteor. But not even these monstrosities can prepare them for Triclops, a 50-ft tall, three-eyed behemoth who rules this lost world with an iron fist. Samantha believes that the colossal beast is really her missing lover, mutated beyond human comprehension. Her affection may be tragically misplaced, however, when the monster picks the beautiful girl for his next dinner...