Agent Carter is taking down the 1940's most dangerous criminals, but she must do so in secret.

Picking up in the wake of WWII, Agent Carter will follow the story of Peggy Carter (Hayley Atwell) as she heads to work at the strategic Scientific Reserve after Captain America's disappearance and supposed death. While Carter's spy skills were fully on display as she fought to take down HYDRA, peacetime will find her shunted to the side and branded a stereotypical "weak" woman.

Luckily for Carter, Howard Stark needs a little help. Fully aware of Peggy's capabilities, Tony Stark's dad will enlist Carter's help when his most dangerous projects are stolen and sold on the black market. Unfortunately for Peggy, her involvement with Stark will have to stay off the record.

"She has an intelligence about her and a skill set that is very impressive, yet we get to see the emotional and psychological cost of her character, of someone who is having to live a double life," Atwell teased in a new behind-the-scenes featurette.

Fans will get to catch up with the pre-SHIELD heroine when Agent Carter debuts on Jan. 6. Set to fill Agents of SHIELD's timeslot during the series' winter hiatus, Agent Carter will open with a two-hour premiere at 8 p.m. ET.

Click the video below to see a preview for "Now is Not the End" and "Bridge and Tunnel."