Catherine Foster was the wife of Captain Marlow and a crew member aboard the Anesidora that ventured to Zeta Reticuli to search for the wreckage of the USCSS Nostromo.
In 2137, the Anesidora recovered the flight recorder unit of the USCSS Nostromo in Zeta Reticuli, her husband Marlow extrapolated the path of the flight recorder in hopes of finding the Nostromo's wreckage and turn it in to Weyland-Yutani for a reward. The path led the Anesidora's crew to the planetoid LV-426 where they also discovered a distress signal. Once they landed on LV-426, Foster, together with Marlow and a third crewmember set foot on Acheron and headed towards the distress signal's source and soon tracked it to a derelict spacecraft. After discovering the fossilized remains of the ship's pilot and deactivating the signal, the crew proceeded to investigate a lower area, accessible through a hole burned in the floor. As the crew descended down to the derelict's lower area, they found themselves in a huge, cavernous chamber filled with Xenomorph eggs. Foster inspected one of the eggs, only to be impregnated by a Facehugger. Marlow and the third crewmember carried the comatose Foster back to the Anesidora and quickly retreated to space in order to find help for Foster. The Facehugger later detached itself from Foster and subsequently died, leaving her to awaken from her coma apparently unscathed. Despite this, Marlow insisted on Foster to remain in hypersleep as he remained suspicious as to what the facehugger had done to her and hoped to slow down the process. Breaking all quarantine procedures, Marlow brought Foster to Sevastopol to have her treated, his efforts were futile however as the Xenomorph embryo that was incubating within Foster violently erupted from her while on the operating table and escaped. Marlow and his crew were later detained by the Colonial Marshals for bringing a foreign creature into Sevastopol Station.
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