(I know the X-Men aren't owned by Disney, but Disney is a popular media corporation, so posting on here might get my theory some views)
We all know about the X-Men. America's favorite team of mutants in the Marvel universe! So popular, that they even made multiple X-Men movies, and few of the X-Men members are some of the most popular and beloved characters you can find within the Marvel Universe.
But, what if there is more to the X-Men than we currently know?
This theory proposes that certain characters from other movies and shows were reincarnated into the X-Men from Marvel. Here it goes