As a founding member of the X-Men, Jean Grey has been fighting for the peaceful coexistence of mutants and humans, as Marvel Girl and later Phoenix, most of her life. While piloting a spacecraft back to Earth, Jean was saved by the Phoenix Force and placed in a cocoon to heal, while the Phoenix impersonated her. After returning, Jean joined the founding members of X-Men in X-Factor and later became an X-Man once again. After her alternate timeline daughter Rachel Summers asked her to adopt the name of Phoenix, Jean did and was later merged with the Phoenix Force. After Jean married her long-time love, Cyclops, he later began to have an affair with sex therapist and former villain, Emma Frost. A powerful telepath and telekinetic, when acting as an avatar of the Phoenix Force, Jean can also wield that entity's incredible powers, such as cosmic pyrokinesis, resurrection, and immortality. Her physical body having been killed by Kuan-Tin Xorn, Jean's connection with the Phoenix Force makes it unlikely that she will ever truly die. She was resurrected by the Phoenix in Phoenix Endsong, and later transformed into the White Phoenix Of The Crown and went back into the White Hot Room. She was presumed dead by everyone after that. However, with the events of Phoenix Resurrection: The Return of Jean Grey, adult Jean Grey is alive once more.