Sebastian Stan jokes his good friend Anthony Mackie will keep him from joining Captain America 4. Stan has been a part of the Marvel Cinematic Universe almost since the very beginning, having made his first appearance in the 2011 movie Captain America: The First Avenger. As Bucky Barnes, HYDRA's prized assassin the Winter Soldier and best friend to Steve Rogers (Chris Evans), Stan has appeared in a total of 7 movies (post-credit scenes included) and two television shows. His most recent live-action appearance came in last year's Disney+ event The Falcon and the Winter Soldier, where he starred opposite Mackie.
Fans wondered all throughout The Falcon and the Winter Soldier's 6-episode run if it would get a second season, and Marvel responded by announcing the development of Captain America 4 on the day of the finale. Mackie's Sam Wilson ended Falcon and the Winter Soldier by accepting the mantle of Captain America, and the movie is expected to continue his journey as the MCU's newest iteration of the hero. Aside from Mackie, the only people attached to Captain America 4 are writers Malcolm Spellman and Dalan Musson; it doesn't even have a director yet.
Related: Thunderbolts Movie Dampens Bucky's Return In Captain America 4
It also doesn't have any co-stars, meaning Stan isn't officially involved with Captain America 4. Many have wondered if he will reunite with Mackie to continue where The Falcon and the Winter Soldier left off, but as he told Extra while on the red carpet for the Pam & Tommy finale, he doesn't know if he has a part in it just yet. However, he then joked that there's one major obstacle that could get in his way: Mackie himself. While answering the question of if he's in Captain America 4, Stan said:
“I
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