Senator Stern, played by comedian Garry Shandling, in Iron Man 2 (2010) is returning to the Marvel films with Captain America: The Winter Soldier (2014). He was the senator who requested that Tony Stark turn in his armor to the government. Senator Stern had some back story told in the comic book limited series, Iron Man 2: Public Identity (201). Stern is seen in set photos from Movieweb with Agent Sitwell played by Maximiliano Hernandez. Sitwell was confronted by Steve Rogers and Natasha Romanov. In the comic books, Sitwell is a S.H.I.E.L.D. agent who worked closely with Nick Fury, and was later killed by a brainwashed Black Widow in Winter Soldier #10 (2012).
The Winter Soldier film has the return of cast members Cobie Smulders as Maria Hill, Samuel L. Jackson, as Nick Fury, and Scarlett Johansson as the Black Widow. Also returning is Toby Jones as Arnim Zola. In the comic books, Zola is able to keep his brain patterns in a cloned body with the image of his face projected on his chest. Hayley Atwell is also returning to the Captain America franchise as Peggy Carter, the aunt of Sharon Carter, also known as Agent 13. Sharon Carter is a S.H.I.E.L.D. agent who fought with Batroc. Her first appearance was in Tales of Suspense #75 (1966). She had a relationship with Steve Rogers and shot him in Captain America #25 (2007). Agent 13 is played by Emily VanCamp in Captain America: The Winter Soldier. The other returning character is Bucky Barnes played by Sebastian Stan. He was lost over the train carrying Arnim Zola. In the comic books, Ed Brubaker has him recovered and brainwashed to the Russian agent, Winter Soldier. He first appeared as Winter Soldier in Captain America #1 (2005).