Jean Grey appears in the film Dark Phoenix, with her alternative personality "Dark Phoenix" being the main antagonist.
She meets Vuk, who intends to take the Phoenix force from her. However as Vuk is attempting to drain Jean. Jean takes her into outer space, retakes the power that Vuk had received earlier, and then kills her. Jean then disappears in a burst of energy in the form of a phoenix. In the aftermath of the incident, Xavier's school is renamed the "Jean Grey School for Gifted Youngsters".
Jean eventually resurfaces alive on Earth, as she was seen in the school in the canonical future of the New Timeline