It's Monster Week here at IGN so we've asked some of our editors to chime in on what movie monsters freaked them out the most. Now, some of the picks below are from television movies so it's a wee bit of a cheat, but would you really argue that Pennywise isn't worthy of being freaked out over?!

The Thing

Pennywise from Stephen King's It

Fast Zombies

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Alien Invaders

King Kong

In Here. With Us.

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Michael Jackson … and Thriller

"My dad had seen the original movie, The Thing from Another World, when he was a boy so he took me to see the Kurt Russell film when it came out. Well, horror wasn't quite as quaint in 1982 as it was in 1951 because, oh boy, the gore we witnessed unfold. I love The Thing, mind you, but I was so grossed out by the inside-out dog scene that I somehow associated the buttered noodles my mother made for me when I got home with the monster's guts. That was the end of buttered noodles for me for the next several years. An honorable mention has to go to Swamp Thing, which I had the misfortune of watching on cable as -- you guessed it -- my mother was cooking. Needless to say, it took me years to also eat boiled dinner after that. (And I'm from an Irish family so not eating boiled dinner is how famines begin.)""While the made-for-TV adaptation of Stephen King's It may have dated a little bit since its release in 1990, its central monster certainly hasn't. Pennywise the Clown, brought to psyche-snapping life by Tim Curry, will always stay with me as my first real brush with childhood terror; the sort of terror that rendered me motionless in bed while listening for the words 'we alllll float down here, Lucy.' I always knew clowns were frightening, but it was the clown with razor sharp teeth and shining eyes that kicked off a mild case of coulrophobia that stays with me to this day.""If I were tasked to pick my favorite monster I would be hard pressed. Frankenstein, Dracula, the Creature from the Black Lagoon, the Predator, Alien…There’s a special chamber in my heart for each and every one of them. There’s one monstrous fiend, however, that embodies all things no good, very bad, straight up evil, and just plain creepy as hell, and that kiddies is not the Crypt Keeper, no, it’s Pennywise the Dancing Clown. And just how unnerving is that name for an inter-dimensional predator that shapeshifts into its victims worst fears? Let’s face it, clowns are nightmare fodder. Poltergeist certainly knew it and Stephen King – who wrote the novel that the miniseries It, which featured Pennywise, was based on – knows it. There’s something profoundly effective about taking such a distinctive marker of innocence, of the things of childhood, and twisting it into a spine-chillingly sinister beast. It burns itself into your psyche, your memory, your twilight visions…Also, he hangs out drain pipes to lure little boys to their doom. And he eats fear…in the form of people. Mostly children.""I know that fast zombies vs. slow zombies has become something of a hot-button issue with horror aficionados, and I know that the true monsters in most zombie movies are the fellow survivors. But man... I can't deny it - giant packs of undead sprinting at absolute top-speed give me a serious case of the heebie jeebies. I think it's the inescapable nature of them. By the time you see them, if you're on foot, you're dead. There's no time to think, or plan. You've gotta go, and you've gotta go right now. I have a lot of respect for slow-creeping horrors, but knowing I can't outrun what's behind me? Now THAT'S scary.""I don’t know if you can call what scared me a monster as much as you could call it an alien. Aliens creep me the hell out, so when They Live was released and a man got a pair of glasses that exposed aliens disguised as humans I was terrified. I was only 8-years-old when I saw the movie. Imagining that I was actually surrounded by these creepy looking monsters that looked like their faces were melted off prevented me from sleeping that entire week and will still occasionally give me nightmares. Today I watch the film and it’s rather silly, but for an 8-year-old kid with a vivid imagination it was scarring. Thanks a lot They Live. I blame you for not being able to make friends as an adult.""As a tot, nothing scared me more than the Wicked Witch of the West from The Wizard of Oz. (A puppet show once sent me into hysterics, pretty much cementing my wuss status among 5-year olds.) After that debacle, though, the monster that scared me the most was King Kong. Not the original stop-motion version or the laughable Japanese iterations, but the 1976 film starring Jeff Bridges and Jessica Lange (which, in hindsight, is scary for other reasons). Something about the first appearance of Kong, from the moment you saw trees being crushed in his path to his frightening roar and beating of his chest, had me covering my eyes as a kid. These days, it’s laughable that a guy in a monkey suit would terrify me so much. Hmm, maybe I’m still a wuss after all.""Many the movie and TV show resulted in childhood trauma for me -- can we talk about the It’s Alive trilogy at some point? -- but if I were to pick one particular 'monster' that rocked my world, and still does, I’d have to go with the awful, terrifying, what-did-you-do-to-my-f#@king-brain Regan MacNeil from The Exorcist. To be stalked by a creature is one thing, but to become the creature is another matter altogether. Horrifically possessed by a demon (and so effectively directed by William Friedkin at the zenith of his talents!), Linda Blair’s Regan still troubles me deeply. Man, I won’t even Google that s#!t for fear of seeing a picture of her.""Thriller scared the bejesus out of me. That's right -- not even a real horror movie. The Michael Jackson music video 'Thriller' scared me half to death. However, I think it counts as a 'monster movie' because I'd watch the undead music video and the behind the scenes movie on one VHS tape. Plus, John Landis directed it. Every time I went to my Aunt Bonnie and Uncle Jerome's, I'd watch that movie, and I'd cower at the sight of the zombies. And you'd think that watching the documentary of the actors getting into makeup would help me get over my fear, but I still am scarred by the zombies eating fried chicken and the fat zombie coming out of the sewer. Sure, I almost left Mike Boylan's sleepover early after The Amittyville Horror made me forever fear ghost eyes being on the other side of the window, but Thriller is truly terrifying."