Enterprise arrives in an altered 1944 where Nazi Germany, backed by time-traveling aliens, has invaded the eastern United States.
Enterprise finds itself in an altered 1944 in which Nazi Germany has occupied much of the eastern United States with the help of time-traveling aliens. Archer, wounded and held by the Germans, escapes with members of the American resistance.
The aliens, the Na'kuhl, led by Vosk, are using the war to build technology that will let them return to their own time. Silik, also stranded in the era, steals a shuttlepod and flies to Earth, and Tucker and Mayweather are captured while pursuing him. A dying Daniels asks Archer to stop the aliens, and Reed traces the change in history to a murder in 1916. The fourth-season premiere was directed by Allan Kroeker and written by Manny Coto.