Jean Grey is an evolved mutant with powerful telekinetic and telepathic abilities, further enhanced by the cosmic energies of the Phoenix Force. She studied at Xavier's School for Gifted Youngsters and trained as a second-generation member of the X-Men under the tutelage of Professor X.
Jean experienced a transformation into the Phoenix in the X-Men storyline "The Dark Phoenix Saga". She has faced death numerous times in the history of the series. Her first death was under her guise as Marvel Girl, when she died and was "reborn" as Phoenix in "The Dark Phoenix Saga". This transformation led to her second death, which was suicide, though not her last.
Jean was enrolled at Xavier's School for Gifted Youngsters, where Charles recognized her limitless potential as a class five mutant. However, because most of Jean's power was tied to her unconscious mind, Charles decided to create a series of psychic barriers to isolate them from her conscious mind. This resulted in Jean developing a dual personality, which called itself the "Phoenix" in her sessions with Charles. The Phoenix was a purely instinctual being, comprised of Jean's deepest desires, joy and rage. It was unclear how much Jean was aware of the Phoenix, but for most of her life, the dual personality remained dormant.
Along with Scott Summers and Ororo Munroe, Jean was taught by Charles to control her powers. The three of them went on to become the X-Men, a team formed by Charles to protect the world from threats posed by dangerous mutants. Jean became romantically involved with Scott and eventually went on to become a medical doctor.
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