Before Charles Xavier and Erik Lensherr took the names Professor X and Magneto, they were two young men discovering their powers for the first time ... and Professor X's X-MEN.

When it comes to Mutant powers, Warren Worthington III got the short end of the stick among the first class of X ... Angel ...

The X-Men are joining the world's greatest superhero team. See which X-Men actors have joined the cast of Avengers: Doomsday.