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Storm Front (1)
Episode number: 1
Overview: Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.
Storm Front (2)
Episode number: 2
Overview: With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.
Home
Episode number: 3
Overview: Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.
Borderland (1)
Episode number: 4
Overview: When genetic supermen left over from the Eugenics Wars hijack a Klingon ship, Archer must rely on their creator, the criminal Dr. Arik Soong, to help hunt them down.
Cold Station 12 (2)
Episode number: 5
Overview: Arik Soong leads his band of Augments to a medical facility where hundreds of genetically enhanced embryos are still stored, intending to retrieve them and bring them to life.
The Augments (3)
Episode number: 6
Overview: In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.
The Forge (1)
Episode number: 7
Overview: Earth's embassy on Vulcan is bombed, and the ensuing investigation puts Archer and T'Pol on the trail of a Vulcan religious faction hiding in a treacherous desert.
Awakening (2)
Episode number: 8
Overview: Archer and T'Pol encounter the Syrrannites, a radical group hiding in the Vulcan desert, while the NX-01 crew contends with Vulcan power ploys.
Kir'Shara (3)
Episode number: 9
Overview: Archer, T'Pol and T'Pau attempt to bring the Kir'Shara — an artifact believed to contain Surak's original writings — to the Vulcan capital, as the NX-01 gets involved in a Vulcan-Andorian military clash.
Daedalus
Episode number: 10
Overview: The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
Observer Effect
Episode number: 11
Overview: Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.
Babel One (1)
Episode number: 12
Overview: Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
United (2)
Episode number: 13
Overview: Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.
The Aenar (3)
Episode number: 14
Overview: Archer visits Shran's icy homeworld to find an Andorian subspecies called the Aenar, to determine their connection to the marauder destroying ships in the region.
Affliction (1)
Episode number: 15
Overview: While Enterprise visits Earth for the launch of Columbia, Phlox is kidnapped and forced to help the Klingons deal with a grave threat toward their species.
Divergence (2)
Episode number: 16
Overview: With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
Bound
Episode number: 17
Overview: As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.
In a Mirror, Darkly (1)
Episode number: 18
Overview: In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.
In a Mirror, Darkly (2)
Episode number: 19
Overview: In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
Demons (1)
Episode number: 20
Overview: A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
Terra Prime (2)
Episode number: 21
Overview: A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
These Are the Voyages...
Episode number: 22
Overview: Six years in the future, an emotional Captain Archer and the crew return to Earth to face the decommission of Enterprise and signing of the Federation charter.