Dark Phoenix

Dark Phoenix was the Phoenix Force's fall from grace - a state wherein it became corrupted by power. The Phoenix entity became too strong to control for the merely human aspects it had acquired from Jean, but the other X-Men had no way to know what was happening and little chance of preventing a tragedy Professer X helped Jean establish "psychic circuit breakers" in her mind, but they became less and less effective. But Jean had used a Kree Weapon and turned on herself (as the Dark Phoenix) to defeat the Dark Phoenix.

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