Še preden sta Charles Xavier in Erik Lensherr postala zaprisežena sovražnika Profesor X in Magneto, sta bila velika prijatelja in zaveznika, ki sta skupaj z drugimi mutanti skušala rešiti svet pred jedrskim uničenjem. Medtem pa se pojavi drug sovražnik, zlobni Sebastian Shaw, ki želi s svojimi zlobnimi mutanti Riptidom, Azazelom in Emmo Frost svet pahniti v novo vojno krizo. V času reševanja nastale krize se Charles in Erik v svojih prepričanjih povsem oddaljita drug od drugega in za vedno povzročita razkol med Magnetovo Bratovščino in Profesorjevimi Možmi X.
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. Before they were archenemies, they were closest of friends, working together, with other Mutants (some familiar, some new), to stop the greatest threat the world has ever known. In the process, a rift between them opened, which began the eternal war between Magneto's Brotherhood and Professor X's X-MEN.