Robert Downey Jr. returns to the MCU with other confirmed actors including stars Chris Hemsworth and Tom Hiddleston, 'X-Men' stars like Patrick Stewart and Ian McKellen, and a good chunk from the studio's 'Thunderbolts.

Avengers: Doomsday has officially confirmed that an X-Men will be in the film and it will be played by someone from the original Fox movies.

Hosted on Marvel Studios accounts across social media, including Instagram, X (formerly Twitter), and YouTube, the livestream started with a pair of doors on a film set slowly creeping open. What appeared to be someone walking through them was quickly revealed to be a faceless crew member,