Vosk and his people altered Earth's past, threatening to destroy many futures. Frustrated by limited Nazi technology, Vosk offers to return Trip and Mayweather to the Enterprise if Archer assists Vosk in creating his time machine. Vosk releases the prisoners, with Suliban agent Silik taking Trip's form; Silik also needs to stop Vosk. Meanwhile, Alicia's comrades in Nazi-occupied New York learn of Archer's space vessel on the eve of an Allied counterattack. Archer, Silik, and Alicia's comrades attack Vosk's time machine facility to disable its protective shield. Their efforts allow Enterprise to destroy the facility. Daniels returns to tell Archer that the timelines are restored and sends Enterprise home.

When genetically engineered humans left over from the Eugenics Wars hijack a Klingon ship, the Klingons threaten war with Earth. Archer enlists the criminal Dr. Arik Soong, the Augments' creator and "father," to help hunt them down.