Tom Hiddleston and Sebastian Stan will be breaking a huge MCU record by returning as Loki and Bucky Barnes' Winter Soldier, respectively, in 2026's upcoming Avengers: Doomsday. Marvel Studios confirmed the first 27 actors confirmed to be cast in Avengers: Doomsday at the end of March, and while this line-up included some brilliant surprises, there are also many MCU veterans who will be reprising their roles. Among them are some actors who've been in the MCU since the very beginning, and have become some of the franchise's most consistent characters.
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