 The player takes the role of Slade, a mercenary recruited by Martech Industries, Inc. to retrieve a crystal located in the Dome, in the center of the desolated city, which protects those within from the harmful radiation consuming the planet.He must make his way through a chaotic San Antonio and fight military, civilian and security forces combined with irradiated mutants to reach the Dome and retrieve the crystal.This is intended to create a new Dome, and how it is used results in one of two different endings.