 "Gamma World" player characters include unmutated humans (referred to as "Pure Strain Humans" in most editions), mutated humans, sentient animals or plants, and androids.Characters explore Ancient ruins and strange post-apocalyptic societies to gain knowledge of the Ancients and social status for themselves.Common adventure themes involve protecting fragile post-apocalypse societies, retrieving Ancient "artifacts" (science fiction gadgetry such as power armor, laser pistols, and anti-grav sleds), or mere survival against the multifarious dangers of the future (such as gun-toting mutant rabbits, rampaging ancient death machines, or other Gamma Worlders bent on mayhem).