Fallout 4 is futuristic post-apocalyptic action-RPG set in an alternate universe that began to radically diverge from our own shortly after World War II, culminating in a global nuclear war in 2077 that created the post-apocalyptic setting of the Fallout games. The Fallout universe is thematically and stylistically inspired by the culture and technology of the 1950s and pulp science fiction. Fallout 4 is a sequel to the games Fallout, Fallout 2, and Fallout 3.