Peggy Discovers Leviathan In Plot Synopsis For AGENT CARTER Season 1 Episode 6: "A Sin To Err"

"A Sin to Err" - Peggy discovers the shocking truth about Leviathan but doesn't realize that her true enemies are even closer than she imagined. Meanwhile, Souza is close to confirming the truth about Peggy and may just put her in the crosshairs of the SSR, on "Marvel's Agent Carter," Tuesday, February 10 (9:00-10:00 p.m., ET) on the ABC Television Network.

"Marvel's Agent Carter" stars Hayley Atwell as Agent Peggy Carter, James D'Arcy as Edwin Jarvis, Chad Michael Murray as Agent Jack Thompson, Enver Gjokaj as Agent Daniel Sousa and Shea Whigham as Chief Roger Dooley.

Guest starring are Lyndsy Fonseca as Angie Marinelli, Alexander Carroll as Agent Yauch, Ralph Brown as Dr. Ivchenko, Meagan Fay as Miriam Fry, Bridget Regan as Dottie Underwood, Devin Ratray as Sheldon McFee, Steven Hack as Albert, Rick Peters as Dr. Honicky, Dimiter D. Marinov as Fyodor, Dave Matos as Pasha, Victoria Profeta as Josephine, Yasmine Aker as Thelma, Krista Marie Yu as Edith, Kellen Michael as Small Boy, Joyce Greenleaf as Esther, Mike Massa as SSR Agent #1, Marcus Young as SSR Agent #2, and Denney Pierce as SSR Agent #3.

"A Sin to Err" was written by Lindsey Allen and directed by Stephen Williams.

It's 1946 and peace has dealt Peggy a serious blow as she finds herself marginalized when the men return home from fighting abroad. Working for the covert SSR (Strategic Scientific Reserve), Peggy finds herself stuck doing administrative work when she would rather be back out in the field; putting her vast skills into play and taking down the bad guys. But she is also trying to navigate life as a single woman in America, in the wake of losing the love of her life, Steve Rogers – aka Captain America.

When old acquaintance Howard Stark (Dominic Cooper, Marvel's "Captain America: The First Avenger”) finds himself being framed for unleashing his deadliest weapons to anyone willing to pony up the cash, he contacts Peggy - the only person he can trust - to track down those responsible, dispose of the weapons and clear his name. He empowers his butler, Edwin Jarvis (James D'Arcy, “Master and Commander: The Far Side of the World”), to be at her beck and call when needed to help assist her as she investigates and tracks down those responsible for selling these weapons of mass destruction. But Jarvis, who is a creature of habit and sticks to a rigid daily routine, is going to have to make some major life changes if he’s going to be able to keep up with Peggy.

If caught going on these secret missions for Stark, Peggy could be targeted as a traitor and spend the rest of her days in prison – or worse. And as she delves deeper into her investigation, she may find that those she works for are not who they seem, and she might even begin to question whether Stark is as innocent as he claims.