Inseminoid aka Horror Planet was directed by Norman J. Warren and made with a low budget of £1 million, half of which was contributed by the Hong Kong’s Shaw Brothers.
On a desolate planet, a team of 12 Xeno 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 re-enter 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.
Following the burial of Ricky and Gail, Mitch and Sandy (Judy Geeson) return to the caves to collect more crystals. A monstrous creature appears and dismembers Mitch before raping Sandy. Found distraught, Sandy receives treatment from Sharon and chief medical officer Karl (Barry Houghton), who discovers that the assault has triggered an accelerated pregnancy despite the regular intravenous injections of contraceptives given to the women in the team. When further explosions within the catacombs scupper chances of deeper investigation, the surviving members of the team are left with nothing to do but await the arrival of a Xeno rescue shuttle…
You can buy the movie HERE.