Having mysteriously survived the destruction of the Xindi superweapon, a battered Archer awakes to find himself back on Earth in the 1940s in the custody of Nazi SS agents, and learns that Nazi-uniformed aliens have successfully helped Germany invade the United States. When he manages to break free of his captors, Archer joins forces with American resistance fighters to unravel the conspiracy behind the occupation.
Meanwhile, believing Archer sacrificed himself to save Earth, T'Pol and the battle-weary Enterprise crew attempt to figure out how to return to their own time. But then a near-dead Daniels appears and informs them that the future has been wiped out by a faction of the Temporal Cold War, the same faction responsible for the altered events on Earth, and they must be stopped.
