The fourth and final DLC pack was released in July 23, 2013. It features a new single-player campaign called Stasis Interrupted and was developed in collaboration between Gearbox Software and Darkside Game Studios. The new single player campaign add-on explores the tale of Corporal Hicks between Aliens and Alien 3 and explains his survival after the events from those films. The DLC also adds a series of several new achievements for players to unlock, which were initially revealed via the PS3 version of the game.
During the events of Aliens Carter J. Burke manages to send a message to Michael Weyland from Weyland-Yutani confirming the existence of the xenomorph species. Weyland sends the advanced research transport spacecraft WYS Legato to LV-426 with a cargo of human colonists kept in cryostasis to be used as hosts to the xenomorphs. However, the Legato arrives just after the destruction of Hadley's Hope and the departure of the USS Sulaco. After investigating the coordinates of the Alien Derelict the corporates discover the ruins of the craft and harvest several xenomorph eggs and begin experimenting with the colonists. They also pinpoint the location of the USS Sulaco through the network and the Colony's computer logs, sending the Legato to intercept the cruiser. Eleven days later, the corporates connect their ship with the Sulaco, but a xenomorph outbreak takes place in the Legato.
Colonist Lisbeth Hutchins awakens and finds a fellow colonist called Ethan during the chaos. While Ethan tells Lisbeth of the situation, a chestburster erupts from his chest, killing him. Unarmed and confused Lisbeth makes her way through the infested ship, watching corporate PMCs murdering infected colonists. Another colonist called Andrews helps Lisbeth but is killed by a xenomorph. Finally Lisbeth finds ex-Colonial Marine Stone and Turk, two colonists who go with her until the exit port of the ship. There Lisbeth separates to search for her parents while Stone and Turk board the Sulaco to search for military help. Lisbeth finds both her parents dead and begins to feel sick, realizing that she was impregnated with a xenomorph. Just before dying she manages to self-destruct the Legato by taking the ship's coolant system offline.
Stone and Turk manage to arrive at the cryostasis section of the Sulaco, where they find Rebecca "Newt" Jorden, Ellen Ripley and Dwayne Hicks sleeping. While awakening, Corporal Hicks watches a facehugger already attached to Ripley's face. Three Weyland-Yutani PMCs enter the area and during the fight one of the corporates fires his weapon and grazes Ripley's facehugger, which bursts acidic blood that burns both her cryotube and the floor, causing an electrical fire and activating the ship's alarm. During the alarm Turk is knocked unconscious by one of the PMCs, who throws him inside Hicks's cryotube. It closes immediately and is ejected out of cryostasis by the ship's computer, along with Newt and Ripley's cryotubes, sending them to Fury 161 inside an EEV. After killing the remaining PMCs and fighting several xenomorphs inside the vessel, Stone and Hicks escape the Sulaco using a service skiff craft and set course to Fury 161 to rescue Turk, Newt and Ripley, taking them two days to finally arrive. They both witness Ripley's death after she throws herself into a molten pit and are captured by Michael Weyland and several PMCs, who take them back to LV-426 in the still infested Sulaco.
Fourteen weeks later, while in captivity inside the Origin installation near the Alien Derelict, Weyland demands both of them to give him the code for a recorded distress call that Hicks intended to sent to the USCM forces, but didn't manage to. After Stone denies any knowledge of such message he is executed by one of the PMCs. Hicks is chemically tortured for information while Weyland boasts how the colonists and human life in general are of little concern to him. While doing this a Weyland-Yutani scientist named Rick Levy rebels and rescues Hicks while keeping Weyland and his PMCs at bay at gunpoint. Another xenomorph infestation occurs inside the caverns near the Origin complex. Amidst the chaos Levy and Hicks fight their way until they finally arrive at a communications relay station and manage to send part of Hicks's distress call, which is picked up by the US Colonial Marines.