Peggy Carter's (Hayley Atwell) troubles are far from over as things are set to become even more difficult for the Agent. After saying goodbye to Steve Rogers, the love of her life, she fights tooth and nail to preserve his legacy and his efforts in saving the country.

International Business Times reported spoilers for the upcoming season one episode four titled "The Blitzkrieg Button" in which Peggy's life is further complicated by Howard Stark (Dominic Cooper). He returns mysteriously without any reason as she is still trying to blindside the men of SSR (Strategic Scientific Reserve) regarding her true intentions. She battles to keep her bosses in the dark about how she helped Stark. They must, of course, never know. Meanwhile, Carter starts to doubt Stark's real motives as the promotional clip depicts her telling Stark, "Steve Rogers dedicated his life to this country, not to your bank account".

Peggy is also worried that she may be discovered playing a double agent, especially now that Stark is back. Chief Dooley (Shea Whigham) may also be onto Peggy's secret role as he digs up something from the past that can potentially destroy her career at SSR, according to The Christian Times. He stumbles upon this when he chases a clue all the way to Europe. Jack Thompson (Chad Michael Murray) is also hot on the heels of Carter's actions and role as double agent as he is seen saying, "You're trying to hide something" in the promotional clip.

Stan Lee, writer and the face of Marvel Comics, is also set to appear in this episode in a cameo role. Lee has previously appeared in a small role in "The Avengers" and "Agents of Shield". He is supposed to be a man who meets Stark.

Marvel's "Agent Carter" season 1 episode four "The Blitzkrieg Button" airs on Tuesday 27 Jan. 2015 while episode three "Time and Tide" airs on Tuesday 20 Jan. 2015 on ABC at 9 and 8 p.m. respectively.