The Galactic Invaders

On his way to headquarters for briefing, someone tries to murder Captain Keith Cranston - an ominous start for a space mission! But this is just the beginning. As his expedition progresses, Cranston realizes that not only is his own life at stake but everyone in the vast galactic empire of the Earth Federation is in danger. Incredible as it seems to him, the entire civilization is threatened by unimaginably strange aliens. But Cranston suspects that behind those sinister creatures lurks someone who is no stranger to Earth.