Storm Front, Part I

Tucker and Mayweather escape the P-51 fighters and return to Enterprise, which has arrived in a 1944 where Nazi Germany occupies the eastern United States. The Germans are being helped by time-travelling aliens led by Vosk, who supplies advanced weapons in return for the materials to build a temporal conduit home. Archer escapes from German custody with the help of resistance fighters, including the gangster Carmine, and is taken to a safe house in Brooklyn, where he meets Alicia Travers. A mortally wounded Daniels appears aboard Enterprise, warning that the Temporal Cold War has spun out of control. Silik steals a shuttlepod and heads for the surface. Archer tracks down an alien collaborator, learns what Vosk needs, and reaches Enterprise, but Tucker and Mayweather are now prisoners of the Nazis, and Daniels insists Vosk's conduit must be stopped.