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Marvel Debuts 'Avengers: Doomsday' at CinemaCon With December 2026 Release

Attendee reports point to Robert Downey Jr. as Doctor Doom in a multiverse crossover led by the Russo brothers.

Overview

  • Marvel used CinemaCon in Las Vegas to unveil Avengers: Doomsday and confirmed a December 18, 2026 theatrical date.
  • The longer trailer screened only to attendees has not been posted online, prompting fans to urge a release.
  • Industry reporters who saw the footage said Robert Downey Jr. appears as Doctor Doom rather than returning as Iron Man.
  • Kevin Feige defended the casting choice, saying the multiverse gives Marvel freedom to place familiar actors in new roles.
  • The film is positioned as a crossover that reunites original X‑Men actors and brings back Chris Evans as Steve Rogers, with Joe and Anthony Russo directing and a follow-up Secret Wars reported.