Hayley Atwell reprises her role as Carter from the film series, and is joined by regular cast members James D'Arcy, Chad Michael Murray, and Enver Gjokaj.
In 1947 New York City, Chief Jack Thompson and Agent Peggy Carter of the Strategic Scientific Reserve (SSR) apprehend Soviet spy Dottie Underwood.
Newly appointed Chief Daniel Sousa of the Los Angeles SSR office meets with Detective Andrew Henry, who has discovered a woman's body in a frozen lake during a heat wave.
[2] In January 2016, Marvel revealed that main cast members Hayley Atwell, James D'Arcy, Enver Gjokaj, Wynn Everett, Reggie Austin, and Chad Michael Murray would star as Peggy Carter, Edwin Jarvis, Daniel Sousa, Whitney Frost, Jason Wilkes, and Jack Thompson, respectively.
[2] It was also revealed that the guest cast for the episode would include Currie Graham as Calvin Chadwick, Lotte Verbeek as Ana Jarvis, Lesley Boone as Rose Roberts, Sarah Bolger as Violet, Bridget Regan as Dottie Underwood, Sean O'Bryan as Detective Andrew Henry, John Gilbert as elderly teller, Kurtwood Smith as Vernon Masters, Edward Deraney as SSR agent #1, Kevin Ashworth as Agent Fisher, Angela Cristantello as receptionist, Bruce Katzman as medical examiner, Alex Alcheh as rookie cop, Matt Braunger as SSR lab tech Samberly and Jonathan Lavallee as commanding officer.