David Harbour has opened up about the – and he's confirmed a common suspicion about the final act. Harbour played in the movie, and he will be reprising his role for the upcoming Thunderbolts movie, arriving later in . "We were, I think, going to go, and then I think they did want the opportunity to change some stuff," the actor told the (before the ) of Thunderbolts. "The interesting thing about Marvel, that's so great about them, is they do rework stuff. Even big productions. Like Black Widow, the entire third act was reworked as we were shooting, which is incredible. And so, they just want that freedom." The third act of Black Widow sees a massive, CGI-heavy sequence where Natasha Romanoff must escape a base that's falling through the sky. The rest of the film was a fairly grounded thriller, so the sudden fantastical action came as a bit of a surprise. There was also the odd choice to cut to black when Natasha was about to face down General Ross, too. Harbour talked to our sister publication about Thunderbolts last year. "I really like him," , "and I love Florence [Pugh] as Yelena [also in Thunderbolts]. And then you throw in Wyatt [Russell, as ] from and Sebastian [Stan, reprising Bucky Barnes]. You have all these great, colorful characters. I'm really excited for that movie." Amid the , though, . While you wait for Thunderbolts, check out our guide on all the for everything else the MCU has in store.