Lord Voldemort, Harry Potter
No one can cast the Avada Kedavra spell quite like Lord Voldemort He-Who-Must-Not-Be-Named (played in the movies by Ralph Fiennes). He's like the most evil wizard ever and always has that nasty snaked slithering nearby.
Freddy Krueger, Nightmare on Elm Street
With razorbladed gloves and a severly disfigured face, Freddy (played by Robert Englund) stalks his prey where they can't escape: in the world of their dreams! So don't ever plan to fall asleep again or anything, if you want to live that is.
Scar, The Lion King
He. Killed. Mufasa. Jealousy is really not a great color on this jerk of a lion (voiced by Jeremy Irons), who terrorized the Pride Lands and poor, little SImba. Oh yeah, and his hyena henchmen and their constant laughing was just grating.
Barnabas Collins, Dark Shadows
Boy meets witch, boy seduces witch. Boy meets different girl, boy falls in love with girl, witch forces girl to jump off a cliff and curses boy to a life of vampirism. And that's the classic story of how Johnny Depp's vamp alter-ego became undead.
Frankenstein
It's alive! It's alive! The classic tale based on Mary Shelley's novel Frankenstein comes to life in the must-see 1931 film. The dude rips peoples' arms off, so we're not shocked the town's people armed up with pitchforks and torches.
Latex Guy, American Horror Story
A lot went down in the first season of the FX hit: Sex. Murder. Serial murder. More murder. And much was at the hands of the Rubber Suit Man (eventually relieved to be Evan Peters' Tate), who romanced and raped the Hammon women.
Pinhead, Hellraiser
Here's one puzzle you don't want to solve. In the 1987 horror film, opening the puzzle box summons the black robed, horribly mutilated Cenobite leader (played by Doug Bradley) whose weapon of choice is flesh-tearing hooks. Ouch.
Dracula
No monster list would be complete without the original suave blooduscker, Dracula! Using charm to lure damsels to their death, the prince of darkness (originally portrayed by Béla Lugosi) set the standard for sexy vampires forever.
Jason Voorhees, Friday the 13th
Summer camp has never been so bloody. Beware of Crystal Lake, where Jason, wearing his trademark hockey mask, and his mother before him reign terror. Enough terror to warrant a 2009 reboot for plenty more camp counselor killing.
Stefan Salvatore, The Vampire Diaries
Paul Wesley captured the hearts of many as a brooding vampire on The Vampire Diaries, playing opposite bad boy brother Damon. But we have to give him credit: He looks damn good for someone who's been dead for 100 years.
Loki, The Avengers
Sure Thor's brother may go bad in Thor, but he's a full on super villain when it comes time to take on the entirety of Marvel's super squad. Good thing Loki (played by Tom Hiddleston) has a beefed up Chitauri fleet at his beckoning.
Pennywise the Dancing Clown, It
The monster of It is known to take many forms, but it's most recognizable (and traumatizing) as deranged and sadistic Pennywise the Dancing Clown (brought to life...and nightmares by Tim Curry). No balloon animal for us, please.
Smoke Monster, Lost
Described by most of the characters on the ABC cult classic as a "security system" for the island, the violent Smokey is later revealed to be The Man in Black but can take on the form of any dead person. At least, we think that's its story...
Lucifer, Supernatural
No horns or devil tail here. As the modern version of the Prince of Darkness, Mark Pelligrino plays the devil on the CW series and is a constant road block for demon-hunting brothers Sam (Jared Padalecki) and Dean (Jensen Ackles).
Sharktopus
How would you like to have a run-in with a mythical beast that is half shark and half octopus? Oh that amuses you, does it. It's like watching Shark Week on steroids. Or maybe just a movie called Sharktopus. Happy swimming!
The White Walkers, Game of Thrones
"They swept through cities and kingdoms, riding their dead horses, hunting with their packs of pale spiders big as hounds," lore says of the mythical race that appears in both the books and HBO series. Sounds like bad news to us.
Mike Wazowski, Monsters Inc.
Not all monsters are bad! Some are downright adorable, in fact. Take, for example, Billy Crystal's one-eyed, comically klutzy and seriously over-worked monster, Mike Wazowski. Scream that name in Boo's voice for maximum cuteness.
The Thing, The Thing
The Thing has returned with a vengeance. What thing? We are talking about the remake of the '80s gem, that's what! But what is "The Thing," exactly? A shape-shifting alien that assumes the appearance of the people that it kills. Duh.
Edward Cullen, Twilight
Everyone's favorite undead dreamboat! As a vampire he can read minds, is super fast and glitters in the sunlight. So that last one isn't exactly the scariest of monster qualities. But he's a vegetarian vamp, so he's sexier than he is scary.
Eddie Monroe, Grimm
In this spin on classic fairy tales, monsters exist in an underground world of mystery, crime, drama and magic. You just have to have those Grimm genes to see it. Silas Weird Mitchell plays Eddie AKA the reformed "Big Bad Wolf."
The Human Centipede, The Human Centipede
The scientist who kidnaps these poor tourists and turns them into his new "pet" centipede isn't just mad, he's insane! We won't get into the specifics of centipede constructed because then you'll need to bleach your brain to forget it. Yuck.
Hannibal Lecter, The Silence of the Lambs
The voice that sends shivers down your spine every time you hear the name Clarice belongs, of course, to Anthony Hopkins as he takes on on the role of everyone's favoite cannibal. You'll never look at fava beans the same again.
Samara, The Ring
This character from The Ring—a remake of Japan's Ringu—was the scariest import from the Land of the Rising Sun since Godzilla. You watch a VHS and seven days later this creaky killer comes out of the TV and gets ya. Seven days.
Rebecca Evans, The Roommate
Blair Waldorf she is not. Leighton Meester traded designer headbands for roommate bonding (and then some) in this twisted take on dorm life. This is one copycat chick that takes obsession to a new level: Becoming you at any cost.