2137年（異形事件後15年），阿曼達·蕾普莉（Amanda Ripley）攞到其下落不明之母親愛倫·蕾普莉（Ellen Ripley）嘅消息：其宇宙船諾斯特羅莫（Nostromo）嘅飛行記錄儀已畀發現同送至環繞氣體行星KG348運行嘅太空站塞瓦斯托波（Sevastopol）。為咗瞭解母親下落，蕾普莉與Weyland-Yutani企業之機器人塞繆爾斯（Samuels）同埋行政人員妮娜·泰勒（Nina Taylor）登上宇宙船多倫斯（Torrens）去緊塞瓦斯托波，但喺離艦登上太空站時因發生意外，導致蕾普莉同二人分離而被迫獨自行動。
In 2137 (15 years after the Alien Event), Amanda Ripley, Oman · received news from her unaccounted · mother, Ellen Ripley, that the flight recorder of her spacecraft Nostromo had been discovered and sent to the space station Sevastopol orbiting the gas planet KG348. In order to find out her mother's whereabouts, Ripley boarded the spacecraft · Taylor with Samuels, a Weyland-Yutani enterprise robot, and administrator Nina Taylor on a trip to Sevastopo, but was forced to act alone due to an accident while leaving the ship to board the space station, causing Ripley and the two to separate.