U.S. Senator is assassinated by Men in Black, mysterious organization which suppresses all knowledge about UFOs. Agent Rafferty from the U.S. Secret Service will confront them and discover the sinister truth. The only person that can help him comes from another world.

Captain Saxon, an agent for the top secret Omega agency, has been given the assignment of tracking down and either capturing or killing the crew members of a secret space mission who returned to Earth against orders. It seems that they were all infected with an alien parasite, and they were trying to bring its eggs back to Earth. The eggs were lost in an accident, and both Saxon and the astronauts are trying to locate them.