Captain America: The Winter Soldier who played Peggy Carter in "Captain America: The First Avenger", said that she would not appear in the sequel. However Stanley Tucci, who played Dr. Abraham Erskine in the previous film, later said that Atwell would reappear in a flashback scene. Also in January, Marvel Studios announced that the film would be released in 3D, and Anthony Mackie said filming would begin on April 1, 2013. Later that month, Toby Jones, who portrayed Arnim Zola in the first film, said that he would reprise the role in the sequel. By the end of the month, stages were being built for
Captain America: The Winter Soldier going to seem dirty and underhanded and shifty, and people won't be telling the truth." "Three Days of the Condor" in particular was used as the main source of the script structure, following the idea that the protagonist is being chased by a threat they, along with the audience, only discover halfway through the film. The writers felt this approach was similar to how Stan Lee reinvented Captain America in the 1960s and 1970s, with "the Captain dealing with all sorts of the same things that the country [was] dealing with–Vietnam, Watergate and all that stuff–so he gets to have