A crew of interplanetary archaeologists is threatened when an alien creature impregnates one of their members, causing her to turn homicidal and murder them one by one.
After a member of a geological research team who was sent to Saturn's largest moon: Titan crashes their spacecraft into a space station, another team is sent to Titan to investigate, not knowing the terror that awaits them.
After landing on a mysterious planet, a team of astronauts begin to turn on each other, swayed by the uncertain influence of the planet and its strange inhabitants.