Bucky Barnes has appeared in both Thunderbolts/New Avengers and Captain America: Brave New World, but his character trajectory hasn't made sense since The Falcon and the Winter Soldier.

Thunderbolts* gives a new direction to these anti-heroes who already made their MCU debut in past movies, but they were like scattered stones waiting to be honed. Marvel's reply to DC's Suicide Squad,

Marvel Studios has officially rebranded Thunderbolts as The New Avengers, aligning the film’s narrative with broader Multiverse Saga plans.