Following the destruction of the Xindi weapon, the Enterprise crew discovers that they have been sent back in time to 1944. However, history has been altered, leaving Nazi Germany in control of a large portion of the eastern United States.
After crossing the desert and surviving the sand storms, T'Pol and Archer confront the Syrranites in the Forge. The pair meet T'Pau, who denies any connection with the embassy bombing and Admiral Forrest's death. Archer, now possessing the mental essence of Surak known as the 'katra', agrees to let T'Pau extract it, even after T'Pol's mother T'Les warns the ritual may kill him. Meanwhile Vulcan administrator V'Las is willing to destroy Enterprise to make sure an attack on the Syrrannites isn't witnessed. Former Ambassador Soval allies with Commander Tucker to try to ...
Enterprise agrees to escort Tellarite delegates to peace talks with Andorians. En route they rescue several Andorians who abandoned the ship Kumari, who insist it was Tellarites who attacked them. When Enterprise is soon attacked by the same ship which now appears to be a Andorian ship, Archer must prove to the warring races that a third party must be setting them up to fail at their attempt at peace.
While Enterprise is at Earth, Phlox is abducted by the Klingons and forced to research a cure for a virus destined to wipe out the race. Reed is tapped by a secret agency and ordered to betray Archer. Trip transfers to the Columbia.