As Delta Squad retreats to the secure underground labs beneath the colony, Kamille is snatched away by drones and Essex is paralyzed by Seekers while defending the labs' door. Alerted to Delta Squad's presence, the Collector ship retaliates with a powerful laser blast that destroys the anti-ship cannon, and releases dozens of Collector drones and more Seeker Swarms. Unfortunately, the shot is too weak and is deflected by the Collector ship's shields. They make their way to the colony's anti-ship cannon and begin charging it, but Treeya suggests that a low-power shot might be preferable in order to ensure that the colonists are not harmed. Unable to prevent the colonists' capture, Vega decides Delta Squad has to disable the Collector ship so the colonists can be saved. Only Delta Squad, Treeya, and Messner remain free, having arrived at the colony after the initial attack. The Collector ship deploys Seeker Swarms to incapacitate Fehl Prime's colonists, including Captain Toni, Christine, and her daughter April, who looks up to Vega as a hero. As the group begins to head back to the colony, the source of the new jamming is revealed: a Collector ship flies overhead toward the colony. Treeya voices her doubts to the squad, explaining that Liara once worked with Commander Shepard and has since become obsessed with the myths about the Reapers.

When asked what she thinks the device is, Liara reasons that it may be related to Reaper tech before the communication system is suddenly jammed. Taking a fragment of the device, Treeya leads the group to the site of an ancient Prothean communication system, which she uses to contact her mentor, Liara T'Soni. The squad is accompanied by asari anthropologist Treeya and the colonist Messner, who lends them his M35 Mako.ДЄt the signal's location the squad discovers an unknown alien device is its cause Essex destroys it with his biotics, much to Treeya's chagrin. Delta Squad, now a familiar presence to the colonists, is working to finish installing the defenses when Captain Toni orders them to investigate a strange jamming signal originating from the colony's outskirts. Two years later, Fehl Prime has recovered and the Alliance has bolstered the colony's defenses with a heavy anti-ship cannon and military-grade kinetic barriers. In the aftermath, Admiral Steven Hackett orders Delta Squad to remain on Fehl Prime and protect it from future attacks. The sole survivor, Archuk's second-in-command Brood, is spared by Vega and taken prisoner. Meanwhile, Kamille and Essex take out the remaining Blood Pack. Archuk charges and grabs Vega, but Milque kills the krogan before Archuk can strike the final blow. At first, Vega is outmatched by Archuk, unable to penetrate the krogan's heavy shields, but with the help of Nicky's drone, Archuk's shields are overloaded and Vega is able to chip away at his armor. Nicky aids Vega by sending out a combat drone, while Milque provides covering fire with his sniper rifle. When Archuk challenges Delta Squad to show themselves and fight, Vega decides to duel Archuk, distracting the Blood Pack while Kamille and Essex flank them and ambush from behind. Under heavy fire, Vega and Toni scramble to meet up with the rest of the squad, consisting of Kamille, Nicky, Milque, Essex, and Mason. Vega sets Toni's leg, causing him to scream and alert the Blood Pack to their presence. Lieutenant James Vega stays behind to help Delta Squad's commanding officer, Captain Toni, whose leg was badly broken in the crash.

Only one Marine unit, Delta Squad, survives the crash landing of their shuttle, but the Blood Pack execute several members before the rest can retreat to cover. During the landing attempt, each of the Alliance shuttles are shot down by the Blood Pack. In response, the Alliance dispatches several teams of Marines to aid the beleaguered colonists. In 2183, the human colony of Fehl Prime, a major producer of pharmaceuticals for the Systems Alliance, comes under attack by a group of Blood Pack mercenaries led by the krogan Archuk.

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