Jean Grey, one of Marvel Comics' most iconic and powerful mutants, first appeared as Marvel Girl in The X-Men #1 (September 1963), created by Stan Lee and Jack Kirby. Initially the sole female member of the original X-Men team, she possessed telekinetic abilities and later developed telepathy, often portrayed in her early years wearing a green mini-dress costume with yellow accents that became a signature look of the 1960s and 1970s era. As part of Professor Charles Xavier's students, Jean formed a romantic relationship with teammate Scott Summers (Cyclops) and participated in numerous battles against threats like Magneto and the Sentinels, evolving from a relatively restrained hero to one exploring greater psychic potential under Xavier's guidance.
In the late 1970s, under writer Chris Claremont and artists Dave Cockrum and John Byrne, Jean underwent a transformative arc in "The Phoenix Saga" and "The Dark Phoenix Saga" (Uncanny X-Men #101-137, 1976-1980). Exposed to lethal radiation while piloting a space shuttle, she bonded with the cosmic Phoenix Force, adopting a new green-and-gold Phoenix costume and vastly enhanced powers. This led to her corruption as Dark Phoenix, consuming a star and destroying an inhabited planet, culminating in her sacrificial suicide on the Moon to prevent further devastation—one of comics' most pivotal moments.
Jean was revived in 1986 (Fantastic Four #286), revealing the Phoenix had preserved her true body while impersonating her; she rejoined the X-Men, co-founded X-Factor, and later fully embraced the Phoenix identity in various forms, including White Phoenix. Retcons established her as an Omega-level mutant with inherent ties to the Phoenix Force, and recent developments (as of 2025) include resurrections, time-displaced versions, and ongoing explorations of her cosmic role in series like Phoenix Resurrection and X-Men: From the Ashes, cementing her as a symbol of rebirth, power, and internal struggle.