Former Fox X-Men cast make official MCU debut in 'Avengers: Doomsday' trailer at D23

Marvel's second 'Avengers: Doomsday' trailer, unveiled at D23 on 15 August, confirms the former Fox X-Men cast — Patrick Stewart, Ian McKellen, James Marsden, Kelsey Grammer, Rebecca Romijn, Alan Cumming and Channing Tatum — entering the MCU on screen with the Avengers and Fantastic Four for the first time since Disney acquired 20th Century Fox in 2019. The film opens 18 December, per Variety.