Jean Grey (Earth-21399)

Early Life
Jean Grey was born in Annandale-on-Hudson to John Grey, a professor of history at the Bard College, and his wife Elaine Dayspring. Her life was relatively normal up until the age of ten, when she witnessed her best friend, Annie Richardson, get hit by a car. The sight awakened her mutant powers of telepathy, which caused her to hear Annie's last thoughts before she died.

Jean was traumatized by the incident and spiraled into depression. Her parents grew concerned and took her to a psychiatrist. Jean protested throughout the car ride, and the argument between her and her parents escalated until Jean lashed out with her telekinetic powers, crashing their car. Jean's mother did not survive the crash.

The Xavier Institute
John blamed Jean for the death of her mother and became obsessed with trying to "fix" her. He ended up consulting many of his colleagues, most of whom dismissed his story and told him Jean should see a therapist. One such colleague recommended that John take his daughter to Professor Charles Xavier, who had recently opened up his private school in Westchester.

Xavier, secretly a mutant himself, took Jean under his wing as his first student at the Institute, training her to control her powers. During one particular session, while Jean and Xavier were in telepathic contact, a flaming raptor appeared in Xavier's mind. Xavier ended the session there, fearing this was a sign that Jean could not control her own mutation. Later that night, he placed a psychic barrier in Jean's mind that limited the full reach of her power.

The X-Men
To be added...