Sickened by the state of South Boston, Billy returns in secret and begins to lay his plans for all out war against the evil that is consuming Back Bay. Along the way we helps some settlers and finds Trinity Church.
Billy is filled with self-doubt after being appointed to "General" by Preston. He travels to Sunshine Tidings and helps to establish a settlements and on the way encounters Synths as well as Raiders. Saving the Settlers from death and bringing joy to a family of farmers kindles confidence in his ability to lead.
Billy returns to Ten Pines to deliver the good news. Along the way he gets into a gun battle with a band of Raiders and uncovers another suit of power armor that he strips for parts.
Battle weary, Billy fights his way back to the Red Rocket. After the rush of two days of continued violence Billy crashes hard and turns to an unexpected source for comfort.
Billy charges into the Corvega Assembly Plant brandishing the old MP40 from his days in the Engineers Battalion filling the structure with smoke and led. A vicious gun battle rages throughout the abandoned factory as the raiders try to repel the attack and Billy tries not to run out of ammo.
Fresh off the loss of both his wife and grandmother, Billy unleashes hell on the Raiders of Lexington self-medicating guilt with violence.
Billy makes his way to Gram's apartment to find it in ruins but he also begins to put together the pieces to the puzzle of her fate in the days following October 23rd 2087. In the process Billy reverts to old survival tactics learned in the war and a long dormant and much more dangerous Billy emerges.
Billy journey continues taking him through the remains of Lexington and finally across the Charles river into Back Bay. A cloud of doubt and something more dangerous falls over Billing as his path penetrates ever deeper into the depraved hellscape that was once the city he loved.
Billy leaves Dogmeat to look after the settlers at Ten Pines and travels on toward Back Bay. Along the way he attacks a group of Gunners in search of better weapons and gear, meets a mysterious stranger, rides out a bad dust storm and scouts the Corvega Assembly Plant.
Billy begins a long journey downtown to find the apartment of his Grandmother. Hoping to find a stash of his things and perhaps some clues regarding her fate, Billy leave Sanctuary and tops at Ten Pines along the way. He has only just begun to discover just how broken this new world is.