After being infected during by an alien
during a mission to Mars, an astronaut returns to Earth and seeks out
his mate--the beautiful but deadly Sil. Astronaut Ross discovers that
each time he has sex, the woman is impregated with an alien that kills
her in childbirth. Sil wants to mate with Ross to produce a more
perfect alien offspring, and the assassin hired to dispatch the aliens
hopes that she will lead him to Ross and his violent offspring.
