The X-Men are a team of superheroes appearing in American comic books published by the Marvel Comics. The X-Men first appeared in the self-titled X-Men comic, cover dated September 1963. Due to the X-Men's immense popularity, Marvel has launched dozens of spin-off series, called "X-Legs" throughout the years.
Like Uncanny X-Men, most X-books feature mutants, humans born with extraordinary powers due to a genetic mutation. Some X-Books feature mutant superhero teams while others feature solo adventures of characters who became popular in Uncanny X-Men or another X-Book. Occasionally, X-Books use mutants as a metaphor for racial, religious and other minorities oppressed by society.
For the purpose of this list, "X-Men Comics" will be defined by the following criteria: