Season 4
Episode Guide
Storm Front, Pt. 1
S4
E1
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
With Silik's help, Archer searches for the temporal operative who altered Earth's past and threatens to destroy all of time.
Home
S4
E3
Enterprise returns to Earth to a hero's welcome, Archer is haunted by his experiences and actions in the Expanse.
Borderland
S4
E4
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
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
After turning on their creator, the Augments attempt to start a war between Humans and Klingons.
The Forge
S4
E7
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.
Awakening
S4
E8
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.
Kir'Shara
S4
E9
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.
Daedalus
S4
E10
The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
Observer Effect
S4
E11
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
Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
United
S4
E13
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
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
Affliction
S4
E15
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.
Divergence
S4
E16
With Columbia's help, Enterprise's crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
Bound
S4
E17
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
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
In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
Demons
S4
E20
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
Terra Prime
S4
E21
A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
These Are The Voyages
S4
E22
Commander William Riker of the Enterprise-D is torn between his loyalty to Captain Picard and his duty to a former captain.