New footage from "Avengers: Endgame – Encore" reveals that Marvel's Multiverse is collapsing, with thousands of incursions destroying alternate realities. Most significantly, Earth-10005—the universe containing Fox's decades-long catalogue of X-Men and Deadpool films—is shown on a collision course with Earth-1127, with the two realities apparently attacking one another. This development matters because Marvel had previously integrated the Fox films into its wider Multiverse, but now appears poised to write them out entirely as it prepares to launch its own X-Men franchise in 2028.

The footage reveals that other universes have already been destroyed in the incursion event. Earth-10005 was previously established as Wade Wilson's home reality in "Deadpool & Wolverine," connecting decades of Fox's Marvel output to the MCU. Avengers: Doomsday, arriving in December, will see major Fox X-Men actors return for potentially their characters' final appearances, including Patrick Stewart as Charles Xavier, Ian McKellen as Magneto, and Channing Tatum as Gambit, alongside MCU regulars like Robert Downey Jr. as Doctor Doom. This appears to be Marvel's narrative mechanism for gracefully concluding the Fox universe before launching its own X-Men series.