Alien: Isolation's deviously clever xenomorph has been getting a lot of (mixed) praise lately, but it's hardly the first randomized creeper to have chased us through a game. This week, we celebrate five of our favorite relentless, indestructible pursuers, then switch gears to talk about Isolation and Shadow of Mordor before moving on to the fictional universes you'd love to see through the eyes of a new or minor character.