X-Men

Mutants, a small percentage of the human population that carry the mutated X-gene that gives them superhuman abilities, are feared by the majority of the public due to most mutants' inability to control their powers. Professor Charles Xavier transformed his family estate in Massachusetts into a safe haven for young mutants to learn control over their abilities and continue their education. Charles named the school the Xavier Institute.

Formation:

The X-Men formed shortly after Thanos Quest.