When archaeologist Vincent Vandraken witnesses a UFO landing on a nearby hillside, his curiosity encourages him to get out of his car and investigate it more closely. When he approaches the grounded disk, an alien emerges from within it. The alien being offers Vincent an object that needs to be safeguarded. With only moments to decide, Vincent reluctantly agrees to take the object and keep it safe. Later, an evil alien race arrives on Earth in an effort to claim the object for themselves. Vincent finds himself face to face with an adversary that no human as ever faced before. Vincent discovers the importance of the object that he has been entrusted with. Can he protect the planet and keep the object from the hands of the alien invaders?