Doctor Doom

Despite being just a human, Doctor Doom is one of the most powerful villains in the Marvel comic book universe. At times, he’s able to pose a threat to a multiversal menace, such as the Beyonder, because Victor Von Doom can do literally anything with enough preparation. So he’s Thanos’ equal in several different ways, and some believe that Doom might even be a bigger threat than the Mad Titan.

But Marvel can’t use him, even though Fox tried their luck with the character on two separate occasions. In the movies in which he appeared, he stole Silver Surfer's power, which is something that he does a lot in the comics.

The MCU could benefit from such a powerhouse villain. We hope that it will, and that Marvel will make a deal with Fox over the Fantastic Four and some of their villains.