The Marvel Cinematic Universe hasn't been shy of walking on the dark side and exploring creepy characters. In fact, some of the strongest Marvel villains have committed despicable acts that would make other pop culture baddies, such as Darth Vader and Voldemort, blush in embarrassment. Yet, in the comics, there is a rogues' gallery of reprobates that might be too frightening to put on screen. Some of them have faces only a mother could love, while others are just plain harrowing even to consider bringing to the decidedly PG-13 realm of Marvel Studios.
Whether it's a villain without skin or one who lives in another human's stomach, these are the Marvel villains too terrifying to be included in the MCU. Don't forget to vote up the scoundrels that give you the heebie-jeebies!