10. Jeff (Chuck)
Anyone who allows their brain to be poked and prodded for the price of a sandwich isn't exactly right in the head. Not to mention that he's got a knack for stalking people, a foul body odor and is just generally creepy. If we saw him at the Buy More, we'd walk away slowly because sudden movements might send him into a rampage.

9. Percy (Nikita)
Nikita will kill you dead if you cross her, but we're off her radar, so we should totally be safe. It's Percy who has us worried because he just seems to "cancel" people with little to no reason. Plus, he preys on the weak, finding people without families and turning them into cold-hearted killers without any care and then basically forcing them to have sex with old guys for his own gain.

8. Al Capone (Boardwalk Empire)
We just want to hug him, as he's the cutest little gangster you've ever possibly seen. He's sweet around his little deaf son and he'll buy you a big steak as a thank you. But he also has no problem taking down a bunch of Irish gangsters with a big gun or shooting the pillow next to his best friend's ear just for fun. These guys that run hot and cold are disconcerting... plus, we know where his future will take him and it's not exactly warm and cuddly.

7. Gloria (Modern Family)
Have you seen what she can do with a shovel? Yeah, we've got a feeling that not even she knows where all the bodies are buried. Not to mention the fact that her stories about growing up in Colombia are downright disturbing and she reveals just random facts about her troubled past like they are nothing. Someone with that many secrets, and who also flips out when you make fun of her accent, is not someone that should be trusted. We'd keep our mouths zipped around her and just do her bidding. Seems safer.

6. Walternate (Fringe)
Though we are without question in favor of The Other Side winning the war that Walternate is planning on waging, the dude is terrifying. He's an evil genius who has no problem resorting to torture to get his way, and he's threatened to kill our Olivia if she doesn't teach him her world-crossing secrets before he loses his patience. And hey, guy, original-recipe Olivia may be a scowly, stubborn piece of wood, but she's our scowly, stubborn piece of wood. Step off. (But don't kill us. Or inject us with transformation juice. We're sorry!)

5. Father Kellan (Sons of Anarchy)
A corrupt man of the cloth is always clown-level freaky, but this guy is particularly horrifying for holding a man's baby hostage until he agrees to murder his nemesis for him. Not to mention the fact that the most merciful thing we've seen him do so far is give Last Rites to a member of his congregation before he had him garroted inside a church. Not terribly Christian of you, Padre.

4. Sue (Glee)
We've never seen her physically attack someone, but that doesn't mean that she hasn't. Besides, her verbal takedowns are enough to send high school students into therapy for years to come. Her hatred of humanity is not limited to those of any particular race, gender, size, age or sexuality. She'll spew evil rants at just about anyone, especially if they happen to have a strong affinity to for hair gel (Pauly D., stay away!). But the scariest thing about how Sue c's it isn't that she has a public forum for her diatribes, but that she's vigilant and really stops at nothing to get what she wants. Having no morals helps in that regard.

3. Thomas (The Event)
He'd be scarier if weren't such a drama queen, but the mere fact that he can suck entire buildings into underground vortexes, raise the living dead and zap planes out of the sky is undeniably unsettling. We were already paranoid about the recent rash of sinkholes around the world, and the idea that there could be a damn vortex in them as well is keeping us up at night. Thanks for nothing, Thomas.

2. Zoe (Caprica)
Sometimes she's a badass robot with the power to throw sweet young science geniuses across the room. Sometimes she's a virtual teenager with the ability to kick ass ninja style in the middle of a cyber arena. Sometimes she's just a young teen in the midst of a religious terrorist sect who helps blow up trains and such. But the thing that scares us the most about her is that basically she's the one who invented the Cylons (she drew them as a kid and came up with the software to make them humanistic) and started several humanity-destroying wars. It's a true shame that the show just got cancelled and we won't get a chance to see her reach true levels of insanity. Even the murderous Taurons should be very afraid.

1. Katherine (Vampire Diaries)
Damon is a bit on the scary side; he is a bloodthirsty vamp after all. But he can also be a sweet little puppy dog sometimes, particularly where Elena is involved. But Katherine? She's just a full-out killing machine with devious plots that she's had a century to contrive. Her sole reason for existing is just to destroy people, and we have to say, she's quite effective. Just pure evil.

Look back at the scariest TV monsters of all time.

Watch TWoP's editors discuss the scariest people on TV in this segment airing on the New York Nonstop cable news channel: