When zombies, aliens and motorcycle gangs start causing mayhem, you want someone with a badge by your side.
Sure, we love vigilantes as much as anyone, but it's nice for justice to have a public face, even in a world filled with crazy sci-fi concepts. We also really dig crime lords, as you saw a while back, but every master criminal needs a master cop to hunt him down. So, for the latest in our series of features inspired by Syfy's Defiance, we're looking at more than two dozen of our favorite lawmen (and women!) from around the sci-fi world.