Fallout 3 Story Explained: Plot and Endings

Fallout 3 came out in October 2008, the first Fallout made by Bethesda Game Studios. It moves the series to the ruins of Washington, D.C., the Capital Wasteland, in 2277, 36 years after Fallout 2. A teenager leaves Vault 101 to find their father and ends up finishing his life's work, a machine to clean the region's water, while the Enclave tries to take it. This page covers the whole plot and every ending, so it has full spoilers. (Fallout 3)

Before the story begins#

The Lone Wanderer was born in 2258. Their mother, Catherine, died of cardiac arrest just after the birth. Their father, James, a doctor and scientist, had been working with her and Dr. Madison Li on Project Purity, a plan to purify the water of the Tidal Basin and eventually the Potomac. After Catherine died, James gave up the project and took his baby into Vault 101, a vault whose people were told it would never open. (Fallout 3)

James often quoted Catherine's favourite Bible verse, Revelation 21:6, about the "water of life". The Lone Wanderer grew up with a friend, Amata Almodovar, the overseer's daughter, and a bully, Butch DeLoria, leader of the Tunnel Snakes. (Fallout 3)

Escape from Vault 101#

In 2277, when the Lone Wanderer was 19, James left the vault without warning. The overseer, Alphonse Almodovar, panicked. His security officers killed James's assistant, Jonas, and came for the Lone Wanderer. With Amata's help, they got out through the vault door into the Capital Wasteland. (Fallout 3)

The nearest town was Megaton, built around an unexploded atomic bomb. A saloon owner there, Colin Moriarty, had seen James and wanted payment for what he knew. The town could also be destroyed. A man named Mr. Burke offered caps to detonate the bomb on behalf of Allistair Tenpenny, who saw Megaton as an eyesore from his tower. (Fallout 3)

The trail ran on to Galaxy News Radio and its DJ, Three Dog. Outside the station, the Lone Wanderer saw the Brotherhood of Steel fight a super mutant behemoth and met a paladin named Sarah Lyons. Three Dog, who gave the Lone Wanderer their name, wanted his signal boosted before he'd help, then said James had gone to the Jefferson Memorial. In Rivet City, a settlement in a beached aircraft carrier, Dr. Li explained Project Purity and James's past. (Fallout 3)

Tranquility Lane#

At the Jefferson Memorial, where the purifier sat, a holotape left by James led to Vault 112. James had gone there to find Dr. Stanislaus Braun, a Vault-Tec scientist with knowledge of the Garden of Eden Creation Kit. Braun had kept his vault's residents in a virtual reality simulation called Tranquility Lane for two centuries, a 1950s suburb where he played a little girl named Betty and tormented them for fun. James had been turned into a dog. (Fallout 3)

To free him, the Lone Wanderer either did Braun's cruel errands in the simulation or found a hidden failsafe that set a Chinese army loose in it. James woke up, and father and child were reunited. (Fallout 3)

Project Purity and the Enclave#

James and Dr. Li led the Rivet City scientists back to the memorial to restart the project. Soon after they started, the Enclave arrived by vertibird under Colonel Augustus Autumn and took the memorial. Autumn demanded James get the purifier working for them. James flooded the control room with radiation instead, keeping it out of their hands and killing himself. His last words told his child to run. Autumn survived. (Fallout 3)

The Lone Wanderer and Dr. Li escaped through a tunnel and reached the Citadel, the Brotherhood's base in the ruined Pentagon, led by Elder Owyn Lyons, Sarah's father. The purifier still needed the GECK, and the Lone Wanderer went after one in Vault 87. The way in ran through Little Lamplight, a cave town of children, and Murder Pass. (Fallout 3)

Vault 87 turned out to be the source of the Capital Wasteland's super mutants, a vault where Vault-Tec had tested the Forced Evolutionary Virus on its residents. A friendly, educated super mutant named Fawkes helped the Lone Wanderer reach the GECK. On the way out, the Enclave ambushed them and took them prisoner. (Fallout 3)

Raven Rock#

At Raven Rock, the Enclave's mountain base, President John Henry Eden had the Lone Wanderer released from their cell and asked to meet. Colonel Autumn refused his orders and set the soldiers on the Lone Wanderer. When they reached Eden's office, there was no man there. Eden was a ZAX supercomputer that had taken over the Enclave after its defeat on the West Coast, building its personality from the records of past presidents. (Fallout 3)

Eden wanted to finish President Richardson's plan from Fallout 2. He gave the Lone Wanderer a vial of modified FEV and asked them to put it into the purifier. It would kill everyone with mutated DNA, which in the wasteland meant almost everyone, leaving the Enclave in control. The Lone Wanderer could take the vial and leave, or talk Eden into destroying itself and Raven Rock. (Fallout 3; Fallout 2)

Back at the Citadel, the Brotherhood finished bringing a giant pre-war robot, Liberty Prime, back to life. With Prime at the front, they marched on the memorial to take it back. (Fallout 3)

The ending explained#

Inside the memorial, the Lone Wanderer could talk Autumn into standing down or kill him. Then Dr. Li gave the bad news. The purifier had been damaged in the fighting and would explode unless someone typed the activation code into the control room by hand. The control room was full of lethal radiation. (Fallout 3)

In the original release, there are three outcomes:

• The Lone Wanderer goes in. They type the code, 216, after Revelation 21:6, and die of radiation as the purifier starts. (Fallout 3)
• Sarah Lyons goes in instead. She dies, and the Lone Wanderer lives. (Fallout 3)
• Nobody goes in. The purifier explodes and kills everyone in the area. (Fallout 3)

The ending narration judges the Lone Wanderer on their choices, including whether they put Eden's FEV into the water, which would have killed off the wasteland's mutated life. (Fallout 3)

The ending finishes James's work. He took his child into a vault to keep them safe and gave up on the water. His child came out and finished it, at the cost of their own life in the original ending, which is why the verse about the water of life keeps coming back. (Fallout 3)

Broken Steel#

The 2009 add-on Broken Steel changed the ending. The Lone Wanderer, if they went into the control room, woke up in the Citadel two weeks later. Radiation-proof companions such as Fawkes could now start the purifier without anyone dying. While they were unconscious, Liberty Prime had been destroyed by an Enclave orbital strike. (Fallout 3: Broken Steel)

The Enclave was not finished. Its remnants attacked the clean water caravans and gathered at Adams Air Force Base. The Lone Wanderer and the Brotherhood took control of an orbital strike satellite, fought through the base and destroyed the Enclave's mobile base crawler. If the Lone Wanderer had added Eden's FEV to the water, it started to take its toll on the people who drank it. (Fallout 3: Broken Steel)

What later games treat as canon#

Bethesda has never named an official ending. Fallout 4 settles some of it through terminals on the Brotherhood airship Prydwen. They describe the Enclave's defeat in the Capital Wasteland, and say that when Owyn Lyons died, Sarah became Elder and was later killed in battle. So she didn't die in the control room. The Brotherhood went through a run of weak elders until a young Arthur Maxson took over, reunited the Brotherhood with its Outcasts and led it to the Commonwealth. (Fallout 4)

Fallout 4 also has the Brotherhood rebuilding Liberty Prime, which fits with Broken Steel's version of events, where Prime was destroyed. The games never say what happened to the Lone Wanderer after that. (Fallout 4; Fallout 3: Broken Steel)

What it sets up#

Fallout 3's other add-ons are side stories: Operation: Anchorage puts the Lone Wanderer in a military simulation of the war in Alaska, The Pitt takes them to Pittsburgh and a slave uprising over a possible cure for mutation, Point Lookout sends them to a swamp in Maryland, and Mothership Zeta has them abducted by aliens. (Fallout 3: Operation: Anchorage; Fallout 3: The Pitt; Fallout 3: Point Lookout; Fallout 3: Mothership Zeta)

The next game in the timeline, Fallout: New Vegas, returns to the West Coast four years later. The East Coast Brotherhood's story continues in Fallout 4, ten years on. For the full order, see the Fallout timeline and the Fallout story explained. (Fallout 4)