Star Trek: Enterprise — Season 4

Aired 8 October 2004 • 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.

Aired 15 October 2004 • 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.

Aired 22 October 2004 • 43 min

Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.

Aired 29 October 2004 • 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.

Aired 5 November 2004 • 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.

Aired 12 November 2004 • 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.

Aired 19 November 2004 • 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.

Aired 26 November 2004 • 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.

Aired 3 December 2004 • 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.

Aired 14 January 2005 • 43 min

The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.

Aired 21 January 2005 • 43 min

Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.

Aired 28 January 2005 • 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.

Aired 4 February 2005 • 43 min

Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.

Aired 11 February 2005 • 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.

Aired 18 February 2005 • 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.

Aired 25 February 2005 • 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.

Aired 15 April 2005 • 43 min

As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.

Aired 22 April 2005 • 43 min

In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.

Aired 29 April 2005 • 43 min

In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.

Aired 6 May 2005 • 43 min

A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.

Aired 13 May 2005 • 43 min

A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.

Aired 13 May 2005 • 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.