Season 4

Episode Guide

Storm Front, Pt. 1

S4 E1
Oct 8, 2004
Archer and the crew of Enterprise find themselves in 1944 and discover the outcome of World War II was altered by the Temporal Cold War.

Storm Front, Pt. 2

S4 E2
Oct 15, 2004
With Silik's help, Archer searches for the temporal operative who altered Earth's past and threatens to destroy all of time.


S4 E3
Oct 22, 2004
Enterprise returns to Earth to a hero's welcome, Archer is haunted by his experiences and actions in the Expanse.


S4 E4
Oct 30, 2004
Criminal Arik Soong is brought aboard Enterprise to assist in finding some genetically enhanced humans he created after stealing altered DNA left over from the Eugenics Wars.

Cold Station 12

S4 E5
Nov 6, 2004
Soong returns to Cold Station 12 with the Augments, a medical facility where he once worked, where there are hundreds of genetically engineered human embryos stored.

The Augments

S4 E6
Nov 13, 2004
After turning on their creator, the Augments attempt to start a war between Humans and Klingons.

The Forge

S4 E7
Nov 20, 2004
Earth's embassy on Vulcan is bombed and the evidence points to a religious faction known as "Syrrannites", a group following a revolutionary interpretation of the teachings of Surak, the father of Vulcan logic.


S4 E8
Nov 27, 2004
Archer and T'Pol locate the Syrrannites. However, unbeknownst to Archer and T'Pol, more is going on than just a simple act of terrorism.


S4 E9
Dec 4, 2004
Archer, T'Pol and T'Pau attempt to take a sacred, but controversial artefact back to the Vulcan High Council, in hopes of settling an internal struggle going on among the Vulcan people.


S4 E10
Jan 15, 2005
The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.

Observer Effect

S4 E11
Jan 22, 2005
Non-corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.

Babel One

S4 E12
Jan 29, 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.


S4 E13
Feb 5, 2005
Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.

The Aenar

S4 E14
Feb 12, 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


S4 E15
Feb 19, 2005
While Enterprise visits Earth for the launch of Columbia, Phlox is kidnapped and forced to help the Klingons deal with a grave threat to their species.


S4 E16
Feb 26, 2005
With Columbia's help, Enterprise's crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.


S4 E17
Apr 16, 2005
As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls. Soon, their seductive powers begin to affect everyone on board except for Trip and T'Pol.

In a Mirror, Darkly, Pt. 1

S4 E18
Apr 22, 2005
In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.

In A Mirror, Darkly, Pt 2

S4 E19
Apr 30, 2005
In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.


S4 E20
May 7, 2005
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.

Terra Prime

S4 E21
May 14, 2005
A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.

These Are The Voyages

S4 E22
May 14, 2005
Commander William Riker of the Enterprise-D is torn between his loyalty to Captain Picard and his duty to a former captain.