Fallout: New Vegas is set in the Mojave Desert in 2281, more than two centuries after a nuclear war reshaped the American Southwest. The player takes the role of a courier who is ambushed while carrying a mysterious package, shot, and left for dead, only to survive and set out to track down the assailant. That search draws the courier into a larger struggle for control of the Mojave and the vital Hoover Dam, where rival factions such as the New California Republic, Caesar's Legion, and the enigmatic Mr. House each pursue their own vision for the region's future. The choices the courier makes shape their standing with these powers and steer the fate of New Vegas itself. This Ultimate Edition also gathers the game's add-on adventures, sending the courier to a toxin-shrouded casino, the tribal conflicts of Zion, the strange experiments of the Big MT, and the lonely road that trails a vanished courier.