Scourge

The Scourge is a term used on occasion to describe races considered threats to a universe's protagonists (usually the Human race), which often times ravage their foes in one way or another. The word "Scourge" commonly refers to:
 * The Scourge, demonic, telepathic extradimensional entities from Doctor Who;
 * Scourge, an aerial and suicidal strain of Zerg from StarCraft;
 * The Scourge, an affiliation of undead following Arthas Menethil, AKA The Lich King from Warcraft;
 * The Scurge, a viral, xenomorphic mutagen from Scurge: Hive.