Keyes was a member of the military branch USCM (United States Colonial Marines) who is a part of a search and rescue team sent to the Zeta II Reticuli system aboard the USS Sephora to investigate the USS Sulaco in search of Ellen Ripley, Corporal Dwayne Hicks, and the rest of the missing marines who were dispatched to LV-426 19 weeks earlier. After the big explode in the bridge, Winter reaches Keyes, he sees Keyes has been cocooned to the wall with an empty alien egg next to him. Before cutting the cocooned marine, Winter is surprised by an alien drone but quickly kills it. After being freed, Keyes request to continue finding the Sulaco's flight data recorder. Cruz orders both Winters and Keyes to return back to the Sephora but Keyes disobeys. Cruz reluctantly gives them 5 minutes to retrieve the recorder. Upon regrouping with O'Neal and the rest of the marines, the aliens began swarming the survivors just when Keyes opens the airlock door and everybody starts running toward the umbilical. Suddenly, Keyes holds his chest in pain and then a chestbuster breaks through his armor. In an act of desperation, Keyes pulls out a grenade and blows up the umbilical killing Paluski and exposing Winter to the space vaccum.