Star Trek: Enterprise - Season 4

First aired: 10/8/2004 22 episodes

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.

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Episodes

1. Storm Front (1)

Aired: 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.

2. Storm Front (2)

Aired: 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.

3. Home

Aired: 10/22/2004

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

4. Borderland (1)

Aired: 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. Arik Soong, to help hunt them down.

5. Cold Station 12 (2)

Aired: 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.

6. The Augments (3)

Aired: 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.

7. The Forge (1)

Aired: 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.

8. Awakening (2)

Aired: 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.

9. Kir'Shara (3)

Aired: 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.

10. Daedalus

Aired: 1/14/2005

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

11. Observer Effect

Aired: 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.

12. Babel One (1)

Aired: 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.

13. United (2)

Aired: 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.

14. The Aenar (3)

Aired: 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.

15. Affliction (1)

Aired: 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.

16. Divergence (2)

Aired: 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.

17. Bound

Aired: 4/15/2005

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

18. In a Mirror, Darkly (1)

Aired: 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.

19. In a Mirror, Darkly (2)

Aired: 4/29/2005

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

20. Demons (1)

Aired: 5/6/2005

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

21. Terra Prime (2)

Aired: 5/13/2005

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

22. These Are the Voyages...

Aired: 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.