Hayley Atwell reprises her role as Carter from the film series, and is joined by regular cast members James D'Arcy, Chad Michael Murray, Enver Gjokaj, and Shea Whigham.
Edwin Jarvis is attempting to pay off smugglers for delivering a shipping container to America for him, when they pull guns on him and demand a higher price.
SSR chief Roger Dooley, meanwhile, visits a Nazi colonel, Ernst Mueller, in a German prison, who has been sentenced to death the next day.
Dooley offers Mueller a cyanide pill in exchange for information on the Battle of Finow, where the Germans supposedly massacred a battalion of Russians.
Though he tries to convince Carter that he lied to her to protect her feelings, and that he only wanted the Super Soldier blood for medical purposes, she doesn't believe him, and kicks him out.
[2] In January 2015, Marvel revealed that main cast members Hayley Atwell, James D'Arcy, Chad Michael Murray, Enver Gjokaj, and Shea Whigham would star as Peggy Carter, Edwin Jarvis, Jack Thompson, Daniel Sousa, and Roger Dooley, respectively.
[2] It was also revealed that the guest cast for the episode would include Lyndsy Fonseca as Angie Martinelli, Alexander Carroll as Agent Yauch, Dominic Cooper as Howard Stark, Bridget Regan as Dottie Underwood, Benita Robledo as Carol, Meagan Holder as Vera, Joanna Strepp as Gloria, John Bishop as Frank, Tim de Zarn as George, Billy Malone as "large" smuggler, Jeremy Timmins as "larger" smuggler, Chad Danshaw as thug, Jack Conley as Colonel Ernst Mueller, Kevin Cotteleer as Alex Doobin, Gregory Sporleder as Otto Mink, Jim Palmer as goon, Tim Garris as hoodlum, Stan Lee as man (next to Stark) and Sarah Schreiber as Lorraine.
[2] However, Carroll, Robledo, Holder, Strepp, de Zarn, Malone, Timmins, Danshaw, Cotteleer, Palmer, Garris, Lee, and Schreiber did not receive guest star credit in the episode.
To illustrate the difference between Carter (whose "wardrobe is sophisticated, tailored and [uses] saturated colors") and Underwood, Ottobre-Melton gave the latter "an unstructured softness to her look with bits of lace and floral embroidery ...
"[6] The titular Blitzkrieg Button is a device containing a vial of Steve Rogers's blood from Project Rebirth, which has been sought after by the government since Captain America: The First Avenger for its Super Soldier properties.