Jia Jem Wearing Costume From Mass Effect 2

Later on the Normandy, the Illusive Man reveals that the Omega-4 relay - beyond which lies the Collector base - requires Reaper technology for the Normandy to safely navigate through it. Cerberus has located a derelict Reaper, disabled millions of years beforehand, and has sent a science team to recover the device - an IFF transponder. Upon boarding the ship, the derelict vessel puts up kinetic barriers preventing the team from departing the ship. Shepard later discovers that the Cerberus science team members have been killed and transformed into Husks. While battling through swarms of husks, Shepard encounters a friendly geth that saves Shepard from an ambush by several husks. Shepard later recovers the IFF and salvages the geth which is attacked and disabled by the husks. In order to escape the ship, Shepard destroys the reaper's Mass Effect core taking down the kinetic barriers but also destroying the ship. Shepard may turn the geth over to Cerberus or activate it. If activated, the geth adopts the name Legion and joins the team.
Shepard departs with the recruited members on a shuttle towards their next mission as the Normandy prepares the IFF for testing. However, after the IFF is activated, it emits a tracking signal and the Collectors are able to locate and board the Normandy. Joker is forced to give control of the ship to EDI - a potentially dangerous move. Gaining control of the ship, EDI pilots the Normandy away from the Collectors and rids the ship of all enemies, but the entire crew barring Joker is taken by the Collectors. Shepard's hand is forced - Shepard can either complete secondary missions and sacrifice the Normandy's crew, or immediately go through the Omega-4 relay to rescue them.
After traveling through the relay, the game may proceed in different ways. Depending on whether Shepard enters the Omega-4 relay quickly, has upgraded parts of the Normandy, and has earned the loyalty of team members, any combination of crew and team may survive the final mission, which ultimately influences Shepard's fate. After entering the relay, the Normandy enters a massive debris field littered with the wrecks of ancient starships that tried to navigate the Omega-4 relay. After a fight with the debris field's automated defenses, the Normandy encounters and ultimately destroys the Collector cruiser. The shockwave from the explosion, disables the Normandy and forces the ship to crash land on the Collector station. After boarding the station, Shepard and the team fight their way towards the center of the base eventually encountering the Normandy crew and the abducted human colonists. If Shepard delayed entering the Omega-4 relay, the Normandy crew will be harvested by the Collectors and Shepard will only manage to save a few of the human colonists. After rescuing the colonists and crew, Shepard continues to proceed to the large central chamber in the middle of the base and discovers that the Collectors have been constructing a new Reaper, made from the genetic material of the abducted humans and fused with the advanced technology of the Reapers. EDI postulates that the Reapers may be facilitating the Reaper equivalent of reproduction but remains unsure as to the Reapers' true motives. Shepard targets the weak points of the machine, which is in the early stages of construction, and it falls deep into the station core.