Season 4 Episodes

Episode Guide

These are the Voyages...

Season 4, Episode 22 - Air Date: 5/13/2005
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.
Episode Guide

Terra Prime (2)

Season 4, Episode 21 - Air Date: 5/13/2005
A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
Episode Guide

Demons (1)

Season 4, Episode 20 - Air Date: 5/6/2005
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
Episode Guide

In a Mirror, Darkly (2)

Season 4, Episode 19 - Air Date: 4/29/2005
In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
Episode Guide

In a Mirror, Darkly (1)

Season 4, Episode 18 - Air Date: 4/22/2005
In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.
Episode Guide


Season 4, Episode 17 - Air Date: 4/15/2005
As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.
Episode Guide

Divergence (2)

Season 4, Episode 16 - Air Date: 2/25/2005
With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
Episode Guide

Affliction (1)

Season 4, Episode 15 - Air Date: 2/18/2005
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.
Episode Guide

The Aenar (3)

Season 4, Episode 14 - Air Date: 2/11/2005
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.
Episode Guide

United (2)

Season 4, Episode 13 - Air Date: 2/4/2005
Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.
Episode Guide

Babel One (1)

Season 4, Episode 12 - Air Date: 1/28/2005
Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
Episode Guide

Observer Effect

Season 4, Episode 11 - Air Date: 1/21/2005
Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.
Episode Guide


Season 4, Episode 10 - Air Date: 1/14/2005
The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
Episode Guide

Kir'Shara (3)

Season 4, Episode 9 - Air Date: 12/3/2004
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.
Episode Guide

Awakening (2)

Season 4, Episode 8 - Air Date: 11/26/2004
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.
Episode Guide

The Forge (1)

Season 4, Episode 7 - Air Date: 11/19/2004
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.
Episode Guide

The Augments (3)

Season 4, Episode 6 - Air Date: 11/12/2004
In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.
Episode Guide

Cold Station 12 (2)

Season 4, Episode 5 - Air Date: 11/5/2004
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.
Episode Guide

Borderland (1)

Season 4, Episode 4 - Air Date: 10/29/2004
When genetic supermen left over from the Eugenics Wars hijack a Klingon ship, Archer must rely on their creator, the criminal Dr.
Episode Guide


Season 4, Episode 3 - Air Date: 10/22/2004
Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.
Episode Guide

Storm Front (2)

Season 4, Episode 2 - Air Date: 10/15/2004
With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.
Episode Guide

Storm Front (1)

Season 4, Episode 1 - Air Date: 10/8/2004
Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.