Jia Jem Wearing Costume From Mass Effect 2

Shepard, along with Jacob and Miranada, is sent to investigate a recently attacked colony known as Freedom's Progress. While exploring the colony, they encounter Tali, one of Shepard's former squad members, and discover that a mysterious insect-like species known as Collectors were behind the attack and are responsible for abductions at other human colonies. The Collectors live beyond the Omega-4 Relay, a treacherous mass relay with a grim history; no non-Collector ship that has ever passed through the Omega-4 Relay has ever returned. The Illusive Man places Shepard in command of the Normandy SR-2, a more advanced and upgraded frigate modeled after the original Normandy equipped with an onboard A.I. known as EDI (Enhanced Defense Intelligence). With the Illusive Man's guidance, Shepard sets out to recruit a team of highly trained specialists for what is assumed to be a suicide mission.
The Illusive Man initially provides Shepard with dossiers regarding potential recruits: a salarian scientist, a mysterious vigilante named Archangel, a krogan warlord, and a powerful but unstable biotic. The salarian, Dr. Mordin Solus, is found on Omega, working to stop a plague engineered by the Collectors and spread by gangs of Vorcha. Archangel is also found on Omega, and is discovered to be Garrus Vakarian, one of Shepard's previous squad members. The krogan warlord, Okeer, is found attempting to create the perfect krogan through unethical genetic research. Okeer is killed by attacking Blue Suns mercenaries, but he leaves his creation, Grunt, in Shepard's care. The biotic, Jack, is revealed to be a woman also known as "Subject Zero." Cerberus arranges for her to be purchased from the prison holding her; Shepard travels to the prison ship, but is betrayed by the warden, who attempts to capture Shepard for a bounty. Shepard escapes and rescues Jack, who joins the team. If the player has purchased the relevant downloadable content, The Illusive Man will also have dossiers on Zaeed Massani, a veteran mercenary, and Kasumi Goto, a master thief, which Shepard picks up on Omega and the Citadel respectively.
The Illusive Man reveals that a human colony known as Horizon, is under Collector attack, and dispatches the team to save the colony. He notes that one of Shepard's surviving crew members, either Kaidan Alenko or Ashley Williams depending on who the player sacrificed on Virmire in the first game, is stationed at the colony. Shepard arrives and battles the Collectors in an attempt to save the colony. The Commander stops the Collector attack by re-activating the colony's defense batteries forcing the Collectors to flee on their ship. Shepard saves only half of the colonists, the Collectors abduct the rest. Shepard then reunites with a former team member, who leaves feeling betrayed by Shepard working for Cerberus.