Jean Grey is a superhero appearing in American comic books published by Marvel Comics, usually those featuring the X-Men, a group of superheroes of which she is a founding member. Created by writer Stan Lee and artist/co-plotter Jack Kirby, the character first appeared in The X-Men #1. Jean Grey is a member of a subspecies of humans known as mutants—individuals born with superhuman abilities—with Jean possessing psionic powers. Initially capable of using only telekinesis, she later develops the power of telepathy. During her early stint with the X-Men, she used the codename Marvel Girl.