Seasons & episodes
S4 · E1Storm Front (1) 2004-10-08 · 43 min
Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.
S4 · E2Storm Front (2) 2004-10-15 · 43 min
With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.
S4 · E3Home 2004-10-22 · 43 min
Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.
S4 · E4Borderland (1) 2004-10-29 · 43 min
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.
S4 · E5Cold Station 12 (2) 2004-11-05 · 43 min
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.
S4 · E6The Augments (3) 2004-11-12 · 43 min
In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.
S4 · E7The Forge (1) 2004-11-19 · 43 min
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.
S4 · E8Awakening (2) 2004-11-26 · 43 min
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.
S4 · E9Kir'Shara (3) 2004-12-03 · 43 min
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.
S4 · E10Daedalus 2005-01-14 · 43 min
The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
S4 · E11Observer Effect 2005-01-21 · 43 min
Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.
S4 · E12Babel One (1) 2005-01-28 · 43 min
Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
S4 · E13United (2) 2005-02-04 · 43 min
Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.
S4 · E14The Aenar (3) 2005-02-11 · 43 min
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.
S4 · E15Affliction (1) 2005-02-18 · 43 min
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.
S4 · E16Divergence (2) 2005-02-25 · 43 min
With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
S4 · E17Bound 2005-04-15 · 43 min
As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.
S4 · E18In a Mirror, Darkly (1) 2005-04-22 · 43 min
In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.
S4 · E19In a Mirror, Darkly (2) 2005-04-29 · 43 min
In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
S4 · E20Demons (1) 2005-05-06 · 43 min
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
S4 · E21Terra Prime (2) 2005-05-13 · 43 min
A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
S4 · E22These Are the Voyages... 2005-05-13 · 43 min
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.