Reavers are a Humans that feature Firefly.
Some believed they were men that had degenerated into primitivism after living so far from civilization for so long. (Episode: Bushwhacked)
During their raids, some captives were kept alive whilst the Reavers butchered the remaining crew. The bombardment of these horrific events saw the survivors mentally breaking down whereupon they began to emulate the Reavers and become one of them. As a result, these survivors were simply new Reavers that would mutilate themselves and go into berserker rampages against other humans. (Episode: Bushwhacked)
Sometimes, Reavers were known to leave behind booby-traps on ships raided by them with these craft being rigged with explosives that would detonate if another vessel detached from them. (Episode: Bushwhacked)
- Firefly: "Bushwhacked"
- Firefly: Serenity: