- 1 Storm Front (1)
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Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.
Air Date: 2004-10-08
- 2 Storm Front (2)
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With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.
Air Date: 2004-10-15
- 3 Home
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Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.
Air Date: 2004-10-22
- 4 Borderland (1)
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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.
Air Date: 2004-10-29
- 5 Cold Station 12 (2)
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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.
Air Date: 2004-11-05
- 6 The Augments (3)
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In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.
Air Date: 2004-11-12
- 7 The Forge (1)
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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.
Air Date: 2004-11-19
- 8 Awakening (2)
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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.
Air Date: 2004-11-26
- 9 Kir'Shara (3)
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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.
Air Date: 2004-12-03
- 10 Daedalus
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The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
Air Date: 2005-01-14
- 11 Observer Effect
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Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.
Air Date: 2005-01-21
- 12 Babel One (1)
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Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
Air Date: 2005-01-28
- 13 United (2)
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Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.
Air Date: 2005-02-04
- 14 The Aenar (3)
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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.
Air Date: 2005-02-11
- 15 Affliction (1)
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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.
Air Date: 2005-02-18
- 16 Divergence (2)
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With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
Air Date: 2005-02-25
- 17 Bound
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As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.
Air Date: 2005-04-15
- 18 In a Mirror, Darkly (1)
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In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.
Air Date: 2005-04-22
- 19 In a Mirror, Darkly (2)
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In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
Air Date: 2005-04-29
- 20 Demons (1)
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A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
Air Date: 2005-05-06
- 21 Terra Prime (2)
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A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
Air Date: 2005-05-13
- 22 These Are the Voyages...
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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.
Air Date: 2005-05-13