Star Trek: Enterprise/Season Four

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Season Four
Star Trek: Enterprise
Season Premiere October 8, 2004
Season Finale May 13, 2005
Episode Count 22

Season Three



Season Four of Star Trek: Enterprise premiered on October 8, 2004.


# # Title Written By Directed By Airdate Viewers 18-49 Rating Prod.
77 1 Storm Front (1) Manny Coto Allan Kroeker October 8, 2004 2.89M 1% 40358-77
Having mysteriously survived destroying the Xindi superweapon, a battered Archer awakes to find himself back on Earth in the 1940s in the custody of Nazi-uniformed aliens and SS agents, who have successfully helped Germany invade the United States, but when he finally breaks free, Archer joins forces with American resistance fighters Alicia Travers, Sal and Carmine to stop the aliens from destroying America and the future. Meanwhile, believing Archer sacrificed himself to save Earth, T'Pol and the battle-weary Enterprise crew attempt to figure out how to return to their own time, but when a near-dead crewman Daniels appears, he informs them that the only way to return to the 22nd century they know is to stop the aliens who are aiding the Nazis and restore the timeline.
78 2 Storm Front (2) Manny Coto David Straiton October 15, 2004 3.11M 1.1% 40358-78
Entrusted to thwart time-traveling aliens from obliterating countless eras, a rescued Archer reunites with his astonished Enterprise crew to lead his officers and American resistance fighters Alicia Travers and Carmine on a mission in Nazi-occupied New York City of the 1940s to destroy the aliens' massive time machine and save the future. Meanwhile, hoping to forge an alliance with Archer, alien leader Vosk releases his captured prisoners Trip and Travis, but this forces temporal cold war agent Silik to emerge from the shadows to promote his own future agenda against Vosk.
79 3 Home Mike Sussman Allan Kroeker October 22, 2004 3.16M 1.1% 40358-79
As the Enterprise crew revels in a heroes' welcome on Earth, Trip follows T'Pol to the planet Vulcan, excited to visit her home and be introduced to her mother T'Les, but when T'Pol becomes obliged to reconsider marriage to former fiance Koss, the future of their relationship is put in question. Meanwhile, Archer must defend some of his morally questionable decisions during the Xindi conflict before a Starfleet Command panel of inquiry. Later, Phlox experiences prejudice against aliens while on shore leave on Earth with Malcolm and Travis
80 4 Borderland Ken LaZebnik David Livingston October 29, 2004 3.18M 1.1% 40358-80
After a dangerous group of genetically engineered humans called Augments escape from their secluded planet intent on causing all-out war between Earth and the Klingons, the Enterprise crew is called into action and Archer enlists the help of the brilliant criminal Dr. Arik Soong, the scientist responsible for creating the Augments. While searching for the Augments in Klingon-controlled space, Enterprise crosses paths with a band of ruthless alien Orion slave traders, who kidnap T'Pol and eight other crew members off the ship so they can be sold at auction, forcing Archer to enact a risky rescue mission with Dr. Soong's help
81 5 Cold Station 12 Alan Brennert Mike Vejar November 5, 2004 3.39M 1.2% 40358-81
With the help of his genetically engineered creations called Augments, brilliant criminal Dr. Arik Soong and his superhuman "children" break into a secret scientific outpost to steal thousands of Augment embryos, and threaten to release the deadly pathogens stored on site if anyone impedes their plan to build an army. Meanwhile, Archer and the crew search for clues to Dr. Soong's whereabouts on one of the planets where he raised some of the Augments, leading them to find one of the doctor's less perfect children, abandoned by his siblings.
82 6 The Augments Mike Sussman LeVar Burton November 12, 2004 3.39M 1.2% 40358-82
The Enterprise crew must pursue brilliant criminal Dr. Arik Soong and his superhuman Augments across hostile Klingon space to a planet where the geneticist intends to raise an army of his creations, but a surprise revolt by his hostile "children" could lead to the destruction of a Klingon world. Meanwhile, T'Pol confronts Trip about why he's been avoiding her since she decided to go through with her arranged marriage on Vulcan.
83 7 The Forge Judith Reeves-Stevens &
Garfield Reeves-Stevens
Michael Grossman November 19, 2004 3.15M 1.1% 40358-83
After the Enterprise crew is called to Vulcan to investigate the suicide bombing of Earth's embassy and death of a Starfleet Admiral, T'Pol receives a mysterious gift from her mother that leads her and Archer into the planet's most dangerous desert, in search of a mysterious group of Vulcans, who are suspected of the bombing. Meanwhile, as the Vulcan High Command, led by V'Las, argues over how to handle this wave of violence, Malcolm and Travis explore the embassy's debris for additional clues and stumble upon an armed Vulcan bomb.
84 8 Awakening Andre Bormanis Roxanne Dawson November 26, 2004 3.38M 1.2% 40358-84
While investigating the Earth embassy bombing on Vulcan with Archer, T'Pol finds that her mother T'Les has joined a revolutionary group on the verge of being crushed by Vulcan High Command leader V'Las, but the rebels are stunned to learn that Archer might hold the key to their survival. While Vulcan's state of unrest grows more violent, former Ambassador Soval reveals to Trip that the Vulcan High Command also plans to launch a massive sneak attack against rival planet Andoria, an act that could pull Earth into an interplanetary war
85 9 Kir'Shara Mike Sussman David Livingston December 3, 2004 3.19M 1.1% 40358-85
86 10 Daedalus Alan Brennert &
Ken LaZebnik
David Straiton January 14, 2005 3.03M 1.1M 40358-86
The crew welcomes Emory Erickson, the inventor of the transporter device, on board for a series of experiments to test a radical upgrade to the technology, but once Enterprise reaches the test site, Archer realizes that his old family friend has lied and is using the ship to search for his son, lost years before in a transporter misfire. Meanwhile, T'Pol begins to reexamine her Vulcan heritage in the wake of her mother's death.
87 11 Observer Effect Judith Reeves-Stevens &
Garfield Reeves-Stevens
Mike Vejar January 21, 2005 2.76M 1% 40358-87
After Hoshi and Trip contract a deadly virus while exploring a planet, two ghostly aliens possess the bodies of various Enterprise crew members to observe humanity's reaction to imminent tragedy. As the aliens secretly jump bodies to observe, Phlox strives to cure the stricken pair, but with his efforts failing, Archer must make a difficult decision in order to shield the rest of the crew from this growing biohazard.
88 12 Babel One Mike Sussman &
Andre Bormanis
David Straiton January 28, 2005 2.53M 0.9% 40358-88
Ordered to transport a delegation of argumentative Tellarites to a peace conference with the blue-skinned Andorians, Archer and the crew find themselves drawn into a confusing, dangerous situation when a secret Romulan vessel begins attacking ships on all sides. After saving Andorian ally Commander Shran from his ship's wreckage, Archer tries to defuse the brewing blood feud between the delegates. Later, when the crew finds the Romulan ship adrift in space, Reed and Trip lead a team to explore the mysterious vessel.
89 13 United Judith Reeves-Stevens &
Garfield Reeves-Stevens
David Livingston February 4, 2005 2.81M 1% 40358-89
Trapped aboard a mysterious drone ship that's been terrorizing the region, Trip and Malcolm work to outwit the Romulans, who are piloting the vessel via remote control, in order to save their own lives and stop the feuding Andorians and Tellarites from going to war. While working to save his crewmen, Archer attempts to forge an alliance between Andorian Commander Shran and Tellarite leader Gral to face their common enemy, but when one of the alien party is killed, Archer finds himself in the middle of a duel to the death.
90 14 The Aenar Manny Coto Mike Vejar February 11, 2005 3.17M 1.1% 40358-90
Continuing from last week's episode, "United," Andorian Commander Shran leads Archer to his frozen homeworld in search of the Aenar, a hidden, peace-loving race with tremendous psychic abilities, after discovering that one of the mysterious telepaths has been working with Romulans. Meanwhile, Trip and T'Pol attempt to construct a device that will render the Romulans' remote-controlled ship useless and stop their swath of destruction in the region. Later, weary of the continuing friction with T'Pol, Trip comes to a surprising decision.
91 15 Affliction Manny Coto Michael Grossman February 18, 2005 3.17M 1.1% 40358-91
On Earth, Dr. Phlox is kidnapped by a band of Klingons, desperate to find a cure for a genetically-engineered virus that threatens their entire race, and Trip begins his new assignment aboard the starship Columbia as it prepares to embark on its maiden voyage. Meanwhile, Reed's ties to a mysterious intelligence organization compromises his allegiance to Archer and Enterprise. Later, T'Pol attempts her first mind-meld in the search for clues to Phlox's whereabouts.
92 16 Divergence Manny Coto Mike Sussman February 25, 2005 2.96M 1.1% 40358-92
With the help of Captain Hernandez, Trip and the newly-launched starship Columbia, Archer pursues the kidnapped Phlox deep into Klingon territory, as Phlox decides to cooperate with finding a cure to a virus ravaging a Klingon outpost. Meanwhile, Archer demands that Reed disclose his secret orders when his ties to a mysterious intelligence organization are revealed. Later, when Trip temporarily returns to Enterprise, T'Pol tries to broach an uncomfortable subject with him.
93 17 Bound Manny Coto Allan Kroeker April 15, 2005 2.56M 0.9% 40358-93
After Archer forges a deal with the Orions, the trader presents the captain with a gift -- three alluring Orion women, who proceed to seduce all the men on board, except Trip for some mysterious reason. Meanwhile, Trip's continued presence on Enterprise begins to grate on new chief engineer Kelby.
94 18 In a Mirror, Darkly (1) Mike Sussman James Conway April 22, 2005 2.59M 0.9% 40358-94
An amoral, imperialistic version of the Enterprise crew, led by a new captain with Archer as his treacherous first officer, makes an astonishing discovery during a mission into enemy alien territory. Meanwhile, in the alternate universe, a power-hungry Archer schemes against Captain Forrest, his lover Hoshi, and loyal slave T'Pol, so he can lay full claim to the discovery. Later, Phlox happily tortures a captured alien for information Archer needs.
95 19 In a Mirror, Darkly (2) Mike Sussman Marvin Rush April 29, 2005 2.92M 1.1% 40358-95
After using the Defiant to repel a Tholian attack, the power-hungry Archer and Enterprise crew set about using this advanced ship to seize control of all of Earth's Terran Empire. Meanwhile, as Archer takes full command of the Defiant and reviews the alternate history of Starfleet, his duplicitous lover Hoshi, a traitorous T'Pol and a reptilian Gorn stowaway hatch schemes of their own.
96 20 Demons Manny Coto LeVar Burton May 6, 2005 3.01M 1.1% 40358-96
On Earth for a historic Starfleet conference to ratify the coalition of planets, Archer and the crew uncover a plot by a radical xenophobic group of humans called Terra Prime, led by Paxton, who want to put an end to the increasing number and influence of aliens on Earth. Meanwhile, although T'Pol contends she has never been pregnant, she and Trip learn that Terra Prime has information about their child. Later, a female reporter from Travis' past pursues him for a story.
97 21 Terra Prime Judith Reeves-Stevens &
Garfield Reeves-Stevens &
Andre Bromanis
Marvin Rush May 13, 2005 3.8M 1.4% 40358-97
Archer, Reed and Travis combine resources to stop Paxton, a well-armed, radical human isolationist leader from Mars, from destroying Starfleet Command unless all aliens leave Earth immediately. Meanwhile, Paxton's hostages T'Pol and Trip are confronted with a baby girl created from their combined DNA, leaving them to contemplate the possibilities.
98 22 These Are the Voyages ... Rick Berman &
Brannon Braga
Allan Kroeker May 13, 2005 3.8M 1.4% 40358-98
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, ratifying the newly-formed alliance of planets they helped forge, but first the officers must mount a daring, dangerous rescue to save Andorian Commander Shran's kidnapped daughter. Meanwhile, far in the future, Troi suggests that Riker use a Holodeck recreation of this moment in history to search for some command insights

Star Trek: Enterprise Seasons
Season 1 | Season 2 | Season 3 | Season 4