Season 4
22 episodes · Oct 8, 2004
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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S4E1Storm Front (1)
Oct 8, 200443mArcher and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.
S4E2Storm Front (2)
Oct 15, 200443mWith Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.
S4E3Home
Oct 22, 200443mOnce the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.
S4E4Borderland (1)
Oct 29, 200443mWhen 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.
S4E5Cold Station 12 (2)
Nov 5, 200443mArik 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.
S4E6The Augments (3)
Nov 12, 200443mIn defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.
S4E7The Forge (1)
Nov 19, 200443mEarth'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.
S4E8Awakening (2)
Nov 26, 200443mArcher and T'Pol encounter the Syrrannites, a radical group hiding in the Vulcan desert, while the NX-01 crew contends with Vulcan power ploys.
S4E9Kir'Shara (3)
Dec 3, 200443mArcher, 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.
S4E10Daedalus
Jan 14, 200543mThe inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.
S4E11Observer Effect
Jan 21, 200543mNon corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.
S4E12Babel One (1)
Jan 28, 200543mEnterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.
S4E13United (2)
Feb 4, 200543mArcher tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.
S4E14The Aenar (3)
Feb 11, 200543mArcher 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.
S4E15Affliction (1)
Feb 18, 200543mWhile 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.
S4E16Divergence (2)
Feb 25, 200543mWith Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.
S4E17Bound
Apr 15, 200543mAs a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.
S4E18In a Mirror, Darkly (1)
Apr 22, 200543mIn the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.
S4E19In a Mirror, Darkly (2)
Apr 29, 200543mIn the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.
S4E20Demons (1)
May 6, 200543mA xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
S4E21Terra Prime (2)
May 13, 200543mA human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.
S4E22These Are the Voyages...
May 13, 200543mSix 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.