Thunderbolts* originally had a very different antagonist. Wyatt Russell's John Walker, AKA US Agent, initially had the role Sentry took on in the final version of the movie, according to screenwriter Eric Pearson.
"There are a couple of versions where part of Valentina’s manipulation of them, for John Walker, she convinced him that his Super Soldier Serum was deteriorating and he needed updates," he told ComicBook, referring to Julia Louis-Dreyfus' scheming Contessa.
