The Phoenix Force is a powerful extra-terrestrial entity which possesses mortals and amplified their psychic abilities. Its known hosts have included Jean Grey and Rachel Summers, both members of the X-Men. The entity did not physically possess Jean Grey; instead, it created a second body identical to hers and through that body acted for her while she lay in a coma. However, the Phoenix was unable to adapt to its newfound humanity and was driven mad; as the Dark Phoenix, it destroyed a planet populated by sentient creatures and subsequently committed suicide. Jean Grey was later revealed to be alive, and later reassumed the name of the Phoenix after marrying Cyclops.