X-Men's first comic appearance, 1963's The X-Men #1, introduced the original five-member team and their mentor, Professor X, and saw them fight against the evil mutant known as Magneto.

Magneto was introduced as the original antagonist of the X-Men, in 1963's X-Men #1; over time, he has come to be depicted as one of the most powerful, and most morally complex, mutant characters ...