The original adult Jean Grey returned to the Marvel Universe in a new series titled Phoenix Resurrection: The Return of Jean Grey, released on December 27, 2017.

Will Jean Grey come back to life?

It came back to the adult Jean in the 2018 mini-series Phoenix: Resurrection – The Return of Jean Grey, resurrecting and bonding with her again. ... But Jean was alive and well again, and ready to lead the X-Men. Her teenage counterpart soon returned to the past, fulfilling her role in history.

How does Jean Grey come back to life after Dark Phoenix?

But when Magneto sent an electromagnetic pulse during a battle with the X-Men, he gave Jean a massive stroke. To save her from an agonizing death, Wolverine stabbed her and killed her (a moment echoed in X-Men: The Last Stand). The Phoenix Force would then briefly resurrect Jean again in Phoenix: Endsong in 2005.