Scariest Robots

Arnold may be a muscle-bound monster, but when it comes to the Terminator franchise, this sleek, smaller robot is the one that gave us the most nightmares. Not only does his liquid metal body make him more or less indestructible, but his focused, cold eyes silently tell you that he will never quit hunting you until you're no longer alive enough to later lead a human resistance against robots. He also gets bonus points for dressing like a cop.

As if there wasn't enough to fear in Alien, Ripley and company also have to deal with an android totally willing to kill them all to ensure the capture of an alien. Ash seems nice at first, but when his homicidal resolve comes out, he's utterly terrifying and very difficult to kill. He also bleeds white liquid, which is just unsettling, made more so when they lay his decapitated head flat on a table for an interview. It's a relief when they finally unplug Ash and return to the crazy alien.

Before the sequels showed us clouds of them getting shot down like flies, the Sentinels were a truly frightening opponent in The Matrix. Not only were they one of the only "real world" threats our heroes faced, but they looked like squids that had procreated with locusts, something that Mother Nature hopefully never allows to happen. The rapidly moving tiny arms on their chest is the detail pushes them over the line into nightmare territory.

Whatever this thing is, it is not okay. Apparently, this half-formed baby bot is meant to give people comfort when they miss their loved ones. You kind of set it up in a room while the person you miss talks to you through it. The Telenoid R1 is also designed to help kids in classrooms, which may be the worst thing we've ever heard. It's an admirable notion to try and skip the uncanny valley by going purposefully bland, but this is not the way. This is a very bad thing unleashed upon the world.