8. Big Daddy
Few video game monsters are as unsettling as Bioshock's heavy-footed Big Daddies. Far from being inherently evil like the majority of video game (or, indeed, pop culture) baddies, these terrifying giants represent something far more primal. They're never explicitly out to get you, but if they perceive you as a threat to the Little Sisters they're conditioned to protect, the tenacity with which they'll hunt you down is deeply alarming.
Iconic Moment: If you idle on the title screen of the original Bioshock, you witness the unflinching violence of the Big Daddies as they protect a Little Sister from an attacker. After a savage beating from one, a second Daddy drills through the assailant's stomach before punching him in the face, finishing him off. Then, dripping with blood, the lumbering giant tenderly takes the young girl's hand and leads her to safety.