AllMovie

The inhabitants of the planet Zanti establish contact with Earth, and prevail upon its inhabitants to accept custody of their criminals, whom they are incapable of executing. The Zantis demand total seclusion for the prison ship, which the humans grant out of fear that they will use their superior weaponry to destroy them. General Hart (Robert F. Simon) is put in charge of securing the Zanti ship a peaceful, unmolested landing in a desolate section of the California desert; he has also granted permission for one civilian observer, a historian (Michael Tolan), to witness this first contact with an alien race. The security of the Zanti ship is violated, however, when a wanted criminal (Bruce Dern) and his girlfriend (Olive Deering) break into the sealed area. This leads to the death of the man and an attack on the woman, and a breakout by the alien criminals. The insect-shaped occupants of the hive-like spaceship attack the military outpost monitoring their landing, leading to an all-out bloodbath between the aliens and the human defenders.