When 'Marvel's Agent Carter' returns to ABC with Episode 4 titled "The Blitzkrieg Button" on Tuesday, Jan. 27, viewers will see Margaret 'Peggy' Carter (portrayed by Hauley Atwell) confronting new troubles.

According to Christian Today, viewers will see Howard Stark (Dominic Cooper) returning to the series and this will only make Peggy's life all the more complicated. Currently, Peggy is under pressure to keep the people from Strategic Scientific Reserve at bay. While Peggy does not want them to know she is working for Stark, she is also uncertain if she has done the right thing by placing her trust on Stark.

The recently released trailer of "The Blitzkrieg Button" shows Peggy making caustic remarks at Stark. She is seen telling Stark, "Steve Rogers dedicated his life to this country, not to your bank account."

Meanwhile, the official synopsis of 'Marvel's Agent Carter' Episode 4 reads, "Peggy may be in more trouble than usual when fugitive Howard Stark suddenly returns for mysterious reasons. And Chief Dooley chases a new clue all the way to Europe that threatens to destroy Peggy's future at the SSR."

This is an indication that Peggy's boss (Shea Whigham) is determined to find some information regarding her past that may possibly harm her present reputation, even as she is working for SSR. The synopsis suggests that this piece of information will be collected during Chief Dooley's Europe visit.

Apart from her boss, Peggy's colleague Jack Thompson (Chad Michael Murray) will also continue to hassle her with questions. He claims that Peggy is up to something. Hence, Peggy loathes being prodded by Jack. Now, the question is whether or not Jack will discover that Peggy is working as a double agent.

On a side note, spoilers hint that viewers will see Marvel comics writer Stan Lee in a cameo role in the upcoming episode of 'Agent Carter.'