When an industrial spy steals a Xenomorph egg, former Colonial Marine Zula Hendricks must prevent an alien from killing everyone on an isolated colony planet. Tamar Prather is a spy for Venture, a company in direct competition with the Weyland-Yutani Corporation. When Prather steals a Xenomorph egg from a Weyland-Yutani vessel, she takes it to the Venture proto-colony on Jericho 3. Though unaware of the danger the egg poses, the scientists there realize how important it is to their rivals, and seek to use it to gain an edge over the competition. Zula Hendricks--former Colonial Marine and teammate to Amanda Ripley--learns about the stolen egg and infiltrates Venture as a member of their security team. But Zula is a member of the underground resistance that opposes Weyland-Yutani, and is eager to stay under their radar. When Venture resorts to a human test subject, allowing him to be impregnated by the Alien, Zula and scientist Dan McClaren must stop the resulting Xenomorph before it can escape and kill every human being on Jericho 3.