Overview

• At Destination D23, attendees saw a private sizzle reel built from past MCU and Fox X-Men dialogue that pointed to X-Men and Fantastic Four joining MCU heroes.
• Robert Downey Jr. is widely reported to play Doctor Doom, and several legacy X-Men actors are reported to return, though specific roles and story details remain under wraps.
• Marvel has not released public footage or a poster, and outlets have flagged fabricated posters and alleged clips circulating on social media after the event.
• Filming is underway in London, Paul Rudd teased “jaw‑dropping” sets in a video message, and the film is scheduled to open on December 18, 2026.
• Plot rumors, including claims about Doom’s motives, are unconfirmed, and high-profile appearances such as a potential Chris Evans return remain unannounced.