
Season 4 (2004)
Upon returning home after preventing a second Xindi attack, Enterprise explores cultural shifts on Vulcan; forges alliances with Earth's neighbors in the face of Romulan aggression; deals with a plague inside the Klingon Empire; explores the Mirror Universe; and overcomes xenophobic elements to lead an interstellar community.
Episodes: 22
Star Cast: Scott Bakula , Jolene Blalock , Connor Trinneer , John Billingsley ,
Episodes List

Ep.1 Storm Front (1)
Air Date: 2004-10-08
Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.

Ep.2 Storm Front (2)
Air Date: 2004-10-15
With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.

Ep.3 Home
Air Date: 2004-10-22
Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.

Ep.4 Borderland (1)
Air Date: 2004-10-29
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.

Ep.5 Cold Station 12 (2)
Air Date: 2004-11-05
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.

Ep.6 The Augments (3)
Air Date: 2004-11-12
In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.

Ep.7 The Forge (1)
Air Date: 2004-11-19
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.

Ep.8 Awakening (2)
Air Date: 2004-11-26
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.

Ep.9 Kir'Shara (3)
Air Date: 2004-12-03
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.

Ep.10 Daedalus
Air Date: 2005-01-14
The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.

Ep.11 Observer Effect
Air Date: 2005-01-21
Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.

Ep.12 Babel One (1)
Air Date: 2005-01-28
Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.

Ep.13 United (2)
Air Date: 2005-02-04
Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.

Ep.14 The Aenar (3)
Air Date: 2005-02-11
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.

Ep.15 Affliction (1)
Air Date: 2005-02-18
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.

Ep.16 Divergence (2)
Air Date: 2005-02-25
With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.

Ep.17 Bound
Air Date: 2005-04-15
As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.

Ep.18 In a Mirror, Darkly (1)
Air Date: 2005-04-22
In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.

Ep.19 In a Mirror, Darkly (2)
Air Date: 2005-04-29
In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.

Ep.20 Demons (1)
Air Date: 2005-05-06
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.

Ep.21 Terra Prime (2)
Air Date: 2005-05-13
A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.

Ep.22 These Are the Voyages...
Air Date: 2005-05-13
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.