In the distant future, humans are colonizing on other planets across the galaxy. At the same time, humans are mining a valuable energy source called Rift Energy. The rift energy miners, known as Rifters, began mining the Rift Energy from the planets, but some of the Rifters were exposed to the Rift Energy, which transformed them into savage-like mutants known as Outcasts. The Outcasts, protective of the Rift Energy, attacked Rifter mining sites, including a farm owned by brothers Emmett and Logan Graves. An Outcast war party destroyed their rig, and both brothers became exposed to Rift Energy. Logan, unfortunately, mutated into an Outcast, but Emmett was able to remain human thanks to his friend Sydney Cutter, who created a regulator to implant into Emmett’s spine to keep him from transforming into an Outcast. Emmett and Cutter soon become hired gunslingers who travel from planet to planet to protect the Rifter mining sites from Outcast war bands.