Bruno Shepard went to Korlus, the junk yard of the galaxy, to recruit Warlord Okeer. As soon as they landed, some crazy woman was shouting threats over a loud speaker. Great.
The squad was quickly accosted by the Blue Suns. The Blue Suns are now officially off Shepard's Christmas card list. One of the whiny babies was crying about a lot of blood even though he was more than fine. A quick interrogation told them Okeer was breeding a Krogan army for Jedore, but the Krogan were insane and were being used as live ammo training for the mercs. Jedore was the leader of the Blue Suns gang currently on Korlus; she was the crazy woman on the loud speaker. Shepard wished she would just shut up.
After killing a bunch more mercs, they came across a Krogan shooting back at the mercs. He helped them through an area blocked by a big gate. They ran into some more rampaging Krogan, then a bunch more mercs before making it to Okeer's lab. Shepard ran into Rana Thanoptis, an Asari scientist he met back in Saren's lab on Virmire. She made it out in one piece, and had turned her life around... somewhat. Looks like she had traded one mad scientific endeavor for another mad scientific endeavor. She quickly left before trouble started.
Okeer was happy to see Shepard. He showed Shepard his prized creation: a perfect tank-bred Krogan. Between Okeer and Mordin, the Normandy should have no problem coming up with a way to counteract the Collector seeker swarms. Jedore was not happy with Okeer however, and she tried to poison the lab. Okeer agreed to help Shepard if he stopped Jedore. So Shepard ran out and killed Jedore, some Krogan, and big YMIR mech. When they went back to the lab however, Okeer had died, but not before he managed to save his tank-bred Krogan.
Back on board the Normandy, Shepard decided to keep the Krogan in the tank for the time being. Too many unknowns.
* * *
The Illusive Man called Shepard and told him that a colony called Horizon just went silent. It was either under attack by the Collectors or soon would be. The Illusive Man also told Shepard that Kaidan was on the colony. Interesting...
And just in time, Mordin delivered a countermeasure for the seeker swarms.
Shepard landed on the colony far back of the large Collector Vessel that had landed on Horizon. It did not look like they were detected, until they got closer and Collectors flew in. (They have wings!) They rook care of them and then made their way through the colony. The noticed Collectors moving some colonists away in pods. They also encountered some husks, but did not see any Dragon's Teeth, the giant spikes that the Geth used to turn humans into husks. The Geth got that technology from Sovereign; they had found their link between the Collectors and the Reapers.
They soon came across some colonists trapped in a stasis field. That was good news: the Collectors had not finished abducting the colony yet. But some other thing, a Collector General calling itself Harbinger, was able to take control of Collectors on the battlefield, making any threat an even bigger threat. But some more good news: they found a worker who managed to hide before being put into stasis by seeker swarms. He was obviously scared, and blamed the Alliance for the trouble. He did not think much of Kaidan or his 'help', defense towers that did not work properly.
After killing more husks, Collectors (including a Harbinger thrawl), and some abominations called Scions, Bruno Shepard and his squad finally made it to the defense towers where they activated the terminal so EDI could fix the targeting software. Shepard held off some waves of Collectors and husks, and finally a large flying. laser-shooting beast called a Praetorian, before EDI finally fixed the towers and started shooting at the Collector Ship. The Collectors soon took off.
Kaidan showed up, happy to see Shepard had arrived to help, but also mad that Shepard never told him he was alive. When Shepard told him that he had been in a coma while Cerberus patch him back together, Kaidan became openly hostile that Shepard was now working for Cerberus, a known terrorist organization. He left, still mad at Shepard.
* * *
Shepard then went to Illium where he helped Liara, Shiala, and Conrad Verner. Then he saved a crashing ship, opened the tank (hello Grunt), and shut down a Geth-made weather device.