Inseminoid

Inseminoid (titled Horror Planet in the United States) is a British science-fiction horror film released in 1981. Director Norman J. Warren's 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.