Claim: Doctor Doom is a fictional character.

The Marvel Universe is the shared universe where the stories in most American comic book titles and other media published by Marvel Entertainment take place . Marvel superheroes such as the Avengers , the Fantastic Four and the X-Men are from this universe .   The Marvel Universe is further depicted as existing within a `` multiverse '' consisting of thousands of separate universes , all of which are the creations of Marvel Comics and all of which are , in a sense , `` Marvel universes '' . In this context , `` Marvel Universe '' is taken to refer to the mainstream Marvel continuity , which is known as Earth-616 or currently as Earth Prime .