Inseminoid

Inseminoid titled Horror Planet in the United States is a BritishHong Kong sciencefiction horror film released in 1981. Director Norman J. Warrens eighth film, the plot of Inseminoid concerns a group of future scientists excavating the ruins of an ancient civilisation on a distant planet. When a monstrous alien creature attacks and inseminates one of the women in the team, chaos ensues as the unbalanced victim, possessing unnatural strength, murders her colleagues one after another in a psychotic bid to protect her unborn twin hybrid offspring. It stars Judy Geeson, Robin Clarke, and Stephanie Beacham. Victoria Tennant makes an early film appearance.

On a desolate planet, a team ofXeno project scientists are conducting an archaeological excavation of the ruins of an ancient civilisation. Shortly after an underground tomb network is found to contain crystals and wall inscriptions, photographer Dean White Dominic Jephcott is engulfed in a rock blast and left incapacitated. Deciphering the alien language in the caves, xenolinguist Mitch Trevor Thomas theorises that the civilisation was built on the concept of dualism the planet orbits a binary star, and a pair of twins seems to have ruled the race that once inhabited it. Medical assistant Sharon Heather Wright discovers that an energy field surrounds the crystals, which causes her to deduce that a chemical intelligence controlled life on the planet.A mentally unbalanced Ricky Williams David Baxt is driven to reenter the caves when a sample of crystals pulsates and the chemical intelligence exerts its influence through a mark on his arm. Thrown into a grille in a compromised environmental suit, Gail Rosalind Lloyd commits suicide, removing her helmet and freezing to death in the toxic atmosphere while trying to amputate her trapped foot with a chainsaw. Documentation officer Kate Frost Stephanie Beacham shoots Ricky with a harpoon gun before he opens both the inner and outer airlock doors and renders the air inside the base unbreathable. ........

Source: Wikipedia