Archer and the Enterprise find themselves in Earth's past, with events of World War II altered by the Temporal Cold War, in which the Nazis have invaded the United States aided by sinister aliens.

Scott Bakula (Captain Jonathan Archer)
Jolene Blalock (Commander T'Pol)
John Billingsley (Doctor Phlox)
Linda Park (Ensign Hoshi Sato)
Anthony Montgomery (Ensign Travis Mayweather)
Dominic Keating (Lieutenant Malcolm Reed)
Connor Trinneer (Commander Charles 'Trip' Tucker III)

Golden Brooks (Alicia Travers)

Jack Gwaltney (Lt. Col. Vosk)
John Fleck (Silik)
Joe Maruzzo (Sal)
Tom Wright (Lt. Ghrath)
Matt Winston (Daniels)
Christopher Neame (German General)
Steven R. Schirripa (Carmine)

J. Paul Boehmer (SS Agent)
John Harnagel (Joe Prazki)
Sonny Surowiec (German Soldier)

• This entire episode takes place in an alternate past version of 1944.
  
• Daniels arrives on Enterprise and confirms he is the one who brought them into the past. His body is in temporal flux and he dies. He tells them the Temporal Cold War has turned into all-out war.
  
• Golden Brooks plays Maya on the UPN sitcom "Girlfriends".
  
• J. Paul Boehmer previously played a Nazi officer in the Voyager episodes "The Killing Game, Part I" and "The Killing Game, Part II". He also played the drone One in the Voyager episode "Drone". In Season 2, he played Mestral in "Carbon Creek".