Avengers: Doomsday trailer brings back James Marsden’s Cyclops—on Earth-616?

The version of Scott Summers viewers watched disintegrate at Alkali Lake didn’t stay gone for long in canon. X-Men: Days of Future Past sent Hugh Jackman ’s Wolverine back to 1973 to change history, and the movie ’s coda made the fix explicit: Scott is alive and well at Xavier’s School, standing alongside Jean and Professor X like the events of The Last Stand never happened.

That means the Cyclops showing up in the reportedly titled Avengers: Doomsday isn’t a resurrection of an MCU native from Earth-616. It ’s the timeline-reset version of Marsden’s Cyclops from the Fox era stepping into Marvel Studios’ playground via the multiverse — a door the MCU has been propping open for a while now.

How we got here

• X-Men: Days of Future Past — Wolverine’s time-jump rewrites the future in which Cyclops died, and Scott reappears alive in the closing scene.
• Doctor Strange in the Multiverse of Madness — a variant Professor X (Patrick Stewart) confirms the films are willing to reach across universes.
• The Marvels (post‑credits) — Monica Rambeau wakes up in the Fox X‑Men reality with Kelsey Grammer’s Beast, signaling open traffic between worlds.
• Deadpool & Wolverine — Fox‑era mutants collide head‑on with MCU canon, further normalizing crossovers.

Days of Future Past already erased Cyclops’ death — Wolverine changed the past, and Scott was back at school.

As for why Cyclops was killed so abruptly in X-Men: The Last Stand back in 2006, that was less about story and more about calendars. When Bryan Singer left to make Superman Returns — bringing James Marsden with him — Marsden’s availability shrank. Under new director Brett Ratner, Fox wrote Scott out early, an extreme solution the later timeline reset quietly undid.

Exactly how Marsden’s Cyclops enters the MCU in Avengers: Doomsday is the piece still missing. Marvel hasn’t released an official synopsis or confirmed his role on the record.