Where Would They Appear? Unlike the other villains on this list, the Skulls can't appear in the MCU right now. Marvel would need to sign a deal with 20th Century Fox to allow Fantastic Four-related characters to appear, similar to what they did with Sony concerning Spider-Man. If such a deal was reached, then obviously a Fantastic Four movie would be the best place for them to appear. If for some reason that isn't an option, then the next best approach would be to use them in an Avengers movie, preferably in a Secret Invasion adaptation.