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List of Star Trek: Enterprise episodes

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File:Star Trek ENT Season 1.jpg
Season 1 DVD

This list of Star Trek: Enterprise episodes is accompanied by each episode's original airdate on UPN in the United States, along with its Nielsen rating, and number of viewers. When viewing the ratings and numbers, it should be kept in mind that UPN does not have coverage in all regions of the United States; in many areas, the show is aired on other broadcasters at times that are not covered by the ratings. UPN itself also shows a weekend rebroadcast of each episode which is not rated. The network has also been criticized for allowing affiliates to preempt many episodes of the series for local programming. All these factors have been blamed for the show's dipping ratings.

UPN cancelled the series on February 2, 2005, but it will be allowed to complete its fourth season, with the final episode expected to air in late May.

The four seasons of Enterprise are scheduled to be released on DVD in North America during 2005. In January 2005, Paramount Television announced that the series will enter rerun syndication in the fall of 2005, and that broadcasters covering 95% of the United States had purchased the rights to air past episode of the series (this is greater than the current coverage of UPN in the U.S.).

Spoilers

Some of the episode overviews may contain spoilers, but attempts are made to limit their spoilage. Template:Spoiler

Season 1 (2001-2002)

Abbreviations:

Pic Title Original Airdate NR V #
File:Enterprise ep101 screenshot.jpg "Broken Bow" September 26, 2001 7.0 12.54 101 & 102
First contact with Klingons; Enterprise (NX-01) launched.
No Pic "Fight or Flight" October 3, 2001 5.7 9.18 103
Hoshi faces her fears on an alien ship who's crew was murdered.
No Pic "Strange New World" October 10, 2001 5.0 7.81 104
Alien spores cause psychosis to the away team on an unknown world trapped in a storm.
No Pic "Unexpected" October 17, 2001 5.2 8.16 105
Trip helps an alien crew fix their engines to find himself pregnant.
No Pic "Terra Nova" October 24, 2001 5.1 8.35 106
Early human colony on Terra Nova mysteriously disappeared 70 years ago and the Enterprise finds out why.
File:P'Jem.jpg "The Andorian Incident" October 31, 2001 4.5 7.19 107
Archer, Trip, & T'Pol are taken hostage in the Vulcan monastary of P'Jem.
No Pic "Breaking the Ice" November 7, 2001 4.9 7.36 108
Malcolm and Travis seek Eisilium on a comet while T'Pol considers marriage to Koss.
No Pic "Civilization" November 14, 2001 4.6 7.14 109
Archer, Trip, Hoshi, and T'Pol go undercover to observe a pre-industrial civilization to find they aren't the first observers there.
No Pic "Fortunate Son" November 21, 2001 4.8 6.11 110
The cargo ship Fortunate was attacked by Nausicans and the Enterprise lends a helping hand to find the crew of the Fortunate has secret plans.
No Pic "Cold Front" November 28, 2001 4.7 7.33 111
Archer finds out a crewman on the Enterprise is helping to fight the Temporal Cold War against Silik and some of the Suliban.
No Pic "Silent Enemy" January 16, 2002 3.7 6.11 112
Archer faces an enemy that doesn't respond to hails while Hoshi tries to find what Malcolm's favorite food is to surprise him for his birthday.
No Pic "Dear Doctor" January 23, 2002 3.7 5.65 113
Phlox & Archer must decide where their morals lie about letting a species live or die from a pandemic.
No Pic "Sleeping Dogs" January 30, 2002 3.9 6.50 114
Hoshi, Malcolm and T'Pol board an unresponsive Klingon ship on decaying orbit into the crushing pressures of a gas giant.
File:Enterprise ep117 screenshot.jpg "Shadows of P'Jem" February 6, 2002 3.8 6.05 115
Vulcans against Andorians on Coridan after the Andorians destroy the Vulcan monestary P'Jem and the hidden spy facility underneath.
No Pic "Shuttlepod One" February 13, 2002 3.4 5.33 116
Reed and Trip stranded in a shuttlepod with no foreseeable help arriving before life support runs out.
No Pic "Fusion" February 27, 2002 3.0 4.49 117
T'Pol experiences her first mind meld by a Vulcan exploring his emotions.
No Pic "Rogue Planet" March 20, 2002 3.3 4.69 118
The Enterprise finds a solitary planet with Eska hunters hunting an indigenous species.
No Pic "Acquisition" March 27, 2002 3.4 5.45 119
Ferengi hijak the Enterprise, with her crew subdued by a gas except for Trip who was in decontamination, to take all of value.
No Pic "Oasis" April 3, 2002 3.3 5.64 120
Archer, T'Pol, Trip and Travis find a crew alive on a ship that crash-landed years ago.
No Pic "Detained" April 24, 2002 3.0 4.88 121
Archer and Travis find themselves inprisoned in a Suliban internment camp by the Tandarans.
No Pic "Vox Sola" May 1, 2002 3.4 5.40 122
An unknown alien boards Enterprise and starts capturing crew members and links them together neurologically.
No Pic "Fallen Hero" May 8, 2002 3.2 5.34 123
Enterprise finds itself under attack for transporting a Vulcan ambassador.
No Pic "Desert Crossing" May 8, 2002 3.0 4.68 124
Trip and Archer find themselves crossing a desert after being lured there by a man they who's ship was fixed by Trip.
No Pic "Two Days and Two Nights" May 15, 2002 3.1 5.26 125
Shore leave on Risa.
No Pic "Shockwave" May 27, 2002 3.3 5.28 126
A planet is destroyed and blamed on the Enterprise with Archer transported to a decimated 31st century.

"Broken Bow" aired as a two-hour episode on UPN. When the series enters syndication, it is expected to air as a two-part episode.

Season 2 (2002-2003)

Abbreviations:

Pic Title Original Airdate NR V #
No Pic "Shockwave, Part II" September 18, 2002 3.2 4.89 201
Suliban take over Enterprise
No Pic "Carbon Creek" September 25, 2002 3.0 4.84 202
T'Pol tells the tale of crash-landed Vulcan crew on Earth in the 1950s.
No Pic "Minefield" October 2, 2002 3.5 5.25 203
Enterprise snags a cloaked mine and race to disable it under the threat by Romulans.
No Pic "Dead Stop" October 9, 2002 3.5 5.41 204
Enterprise is repaired by an unmanned and automatic repair station.
No Pic "A Night in Sickbay" October 16, 2002 3.9 6.26 205
Archer goes stir crazy in sickbay while waiting for Porthos to recover.
No Pic "Marauders" October 30, 2002 3.6 5.60 206
Archer barters for deuterium from a colony plagued by Klingon marauders seeking deuterium as well.
No Pic "The Seventh" November 6, 2002 3.2 4.82 207
T'Pol revives a previous job to seek a two-decade-on-the-run fugitive. During the mission, a dark secret from her past is revealed, shattering her emotional control.
No Pic "The Communicator" November 13, 2002 3.0 4.46 208
After a short trip by Archer and Trip on a planet, Trip discovers he lost his communicator on the pre-industrial planet and is captured while trying to retrieve it.
No Pic "Singularity" November 20, 2002 3.1 4.83 209
Enterprise charts a course through a trinary star system to investigate a black hole but the crew finds themselves with a case akin to OCD.
No Pic "Vanishing Point" November 27, 2002 2.5 3.78 210
Hoshi finds herself invisible after her first transporter use to escape a storm on a planet.
No Pic "Precious Cargo" December 11, 2002 3.1 4.67 211
Answering a call for help, Trip is kidnapped along with royalty.
No Pic "The Catwalk" December 18, 2002 3.0 4.73 212
The Enterprise crew takes refuge in a nacelle to avoid an unescapable radiation belt.
No Pic "Dawn" January 8, 2003 2.5 3.99 213
Trip is fired upon by an Arkonian ship and is stranded on a planet with his attacker.
No Pic "Stigma" February 5, 2003 2.9 4.40 214
T'Pol gets pan'aar syndrome contracted from her mind meld in Fusion.
No Pic "Cease Fire" February 12, 2003 2.9 4.78 215
Archer negotiates a cease fire between Andorians and Vulcans.
No Pic "Future Tense" February 19, 2003 2.9 4.62 216
Enterprise finds a derilict ship only to be attacked by Suliban and Tholian ships.
No Pic "Canamar" February 26, 2003 2.8 4.10 217
Mistaken as smugglers, Archer and Malcolm find themselves on a prisoner transport ship.
No Pic "The Crossing" April 2, 2003 2.6 3.85 218
Noncoporial aliens attempt to take over the Enterprise.
No Pic "Judgement" April 9, 2003 2.5 3.69 219
Klingon tribunal for Archer for conspiring against the Empire.
No Pic "Horizon" April 16, 2003 2.2 3.37 220
Travis visits his family on their cargo ship after a chance course change.
No Pic "The Breach" April 23, 2003 2.3 3.19 221
Due to a militant faction's demands, Enterprise is asked to retrieve Denobulan geologists before the deadline.
No Pic "Cogenitor" April 30, 2003 2.7 4.08 222
The Enterprise encounters the Vissians, a more technologically advanced species, and Trip finds himself transfixed on the fact the Vissians are a three-sexed species.
No Pic "Regeneration" May 7, 2003 2.7 4.12 223
Borg hijack a starship transport.
No Pic "First Flight" May 14, 2003 2.4 3.30 224
Archer recounts his early career as an experimental warp engine pilot to T'Pol.
No Pic "Bounty" May 14, 2003 2.3 3.54 225
Archer is kidnapped by a Tellarite at the bounty of the Klingons for escaping from Rura Penthe after his Judgment and T'Pol experiences Pon farr.
No Pic "The Expanse" May 21, 2003 2.8 3.88 226
Alien probe attacks Earth, killing 7 million people, and Enterprise heads toward the attacker in the Expanse.

Season 3 (2003-2004)

Abbreviations:

Pic Title Original Airdate NR V #
No Pic "The Xindi" September 10, 2003 2.6 4.07 301
The mission against the Xindi starts off with Archer and Malcolm making a visit to a mining facility in order to track down a Xindi.
No Pic "Anomaly" September 17, 2003 2.6 4.29 302
The crew of the Enterprise first encounters the anomalies of The Expanse and learns of the existence of giant spheres that seem to be behind its existence.
No Pic "Extinction" September 24, 2003 2.6 4.00 303
During an unexpected wild goose chase pursuing the Xindi, Archer, T'Pol, and Hoshi are exposed to an alien virus and begin to mutate into members of a long-dead race called the Loque'eque.
No Pic "Raijin" October 1, 2003 2.7 4.52 304
A slave girl is accepted aboard Enterprise as a refuge, but spies on the crew instead. Meanwhile, Archer learns that synthesized Trellium-D can be used to protect the vessel from the anomalies.
No Pic "Impulse" October 8, 2003 2.8 4.17 305
The Enterprise encounters a Vulcan ship in which the crew has become "infected" by a potent neurotoxin related to Trellium-D that causes permanent neural damage. T'Pol becomes infected and loses control of her emotions, becoming paranoid and nearly homicidal.
No Pic "Exile" October 15, 2003 2.3 3.46 306
A Beauty and the Beast-like tale involving Hoshi encountering a telepathic exile (who has Xindi-related information) on a deserted world.
No Pic "The Shipment" October 29, 2003 2.5 3.70 307
The Enterprise crew learns of a shipment of kemocite, a key element in a new weapon being built to destroy Earth.
No Pic "Twilight" November 5, 2003 2.6 4.06 308
An anomaly causes Archer to lose his short-term memory. Much of the episode takes place in an alternate future after the destruction of Earth in which Archer (with the help of his caretaker T'Pol and Captain Charles Tucker), seeks a way to correct the past.
No Pic "North Star" November 12, 2003 2.6 3.88 309
A planet resembling the American "Old West" is found to be inhabited by humans.
No Pic "Similitude" November 19, 2003 3.0 4.59 310
Trip becomes comatose after a plasma manifold explodes and a clone of him is created. Archer's order to kill the clone in order to harvest a needed body part save Trip is met with resistence.
No Pic "Carpenter Street" November 26, 2003 2.5 3.71 311
With the help of Daniels, Archer and T'Pol go back in time after discovering a group of Xindi reptilians are creating a biological weapon in 2004 Detroit.
No Pic "Chosen Realm" January 14, 2004 2.6 3.93 312
Religious zealots hijack the Enterprise and execute Archer for acts of desecration upon the spheres.
No Pic "Proving Ground" January 21, 2004 2.2 3.44 313
Xindi scientists test their new, planet-killing weapon in an asteroid field and Archer finds he has an ally in the Expanse.
No Pic "Stratagem" February 4, 2004 2.6 4.08 314
Archer tries to get information about the location of the weapon from a Xindi.
No Pic "Harbinger" February 11, 2004 2.6 3.95 315
Enterprise encounters the Sphere Builders. T'Pol experences unexpected emotions and initiates a relationship with Tucker. Reed and Major Hayes come to terms with their differences.
No Pic "Doctor's Orders" February 18, 2004 2.6 3.73 316
While the Enterprise passes through a "trans-dimensional disturbance", the crew is put into hibernation, leaving Phlox in control of the ship.
No Pic "Hatchery" February 25, 2004 2.4 3.52 317
Archer does everything he can to save a Xindi insectoid hatchery.
No Pic "Azati Prime" March 3, 2004 2.6 3.78 318
After finding the weapon on Azati Prime, Archer embarks on a suicide mission to destroy it. T'Pol goes into an emotional tailspin as Enterprise suffers a devastating attack by the reptilian Xindi.
No Pic "Damage" April 21, 2004 2.0 2.86 319
Enterprise is heavily damaged by Xindi and seeks exchange of Trellium-D for a warp coil from an alien vessel but is forced to steal it. T'Pol confesses her addiction to liquified Trellium-D.
No Pic "The Forgotten" April 28, 2004 2.2 3.35 320
Archer deals with the loss of many crewmembers and continues peaceful talks with two Xindi species that destroy a fellow Xindi ship in self-defense.
No Pic "E²" May 5, 2004 2.2 3.25 321
The Enterprise crew meet their descendants from an alternate timeline.
No Pic "The Council" May 12, 2004 2.4 3.41 322
Archer speaks at the Xindi council and finds one species has launched the weapon in defiance of the council.
No Pic "Countdown" May 19, 2004 2.3 3.46 323
Archer works to build support from the aquatic Xindi to stop the reptillians and find the sphere builders who are aiding the reptillians.
No Pic "Zero Hour" May 26, 2004 2.7 3.91 324
Final showdown with the reptilian Xindi to stop the weapon from destroying Earth. Archer is lost and believed dead and Enterprise finds itself back in the Second World War era.

Season 4 (2004-2005)

Note: airdates and titles for yet-to-be-broadcast episodes are subject to change.

Abbreviations:

Pic Title Original Airdate NR V #
No Pic "Storm Front" October 8, 2004 1.8 2.89 401
After destroying the Xindi weapon, the Enterprise finds itself in the 20th century during World War II with Nazis in the USA with high-ranking aliens in control.
No Pic "Storm Front, Part II" October 15, 2004 1.8 3.11 402
Archer joins Silik to stop the alien Nazis and end the Temporal Cold War.
No Pic "Home" October 22, 2004 2.0 3.16 403
Enterprise is welcomed home for saving Earth and the crew takes a much needed vacation while Trip & T'Pol visit Vulcan. Erika Hernandez becomes captain of the Columbia (NX-02).
No Pic "Borderland" October 29, 2004 2.1 3.18 404
Dr. Arik Soong restores his relationship with his genetically-enhanced creation: Augments.
No Pic "Cold Station 12" November 5, 2004 2.1 3.39 405
Space station crew held hostage so that Dr. Arik Soong and his Augments can get the remaining Augment embryos and grow them.
No Pic "The Augments" November 12, 2004 2.1 3.39 406
Dr. Arik Soong finds himself overthrown as "father" of the augments and Archer defeats them.
No Pic "The Forge" November 19, 2004 2.0 3.15 407
The Starfleet embassy on Vulcan is partially destroyed by a bomb and Archer & T'Pol seek T'Pol's mother in the desert The Forge.
No Pic "Awakening" November 26, 2004 2.0 3.38 408
Archer & T'Pol find T'Pau and T'Pol's mother and learn that Archer is carrying Surak's katra.
No Pic "Kir'Shara" December 3, 2004 2.2 3.20 409
Archer and T'Pol bring back the Kir'Shara (Surak's artifact) that will lead to vast changes in the Vulcan world. T'Pol's pan'ar syndrome is cured.
No Pic "Daedalus" January 14, 2005 1.9 3.03 410
Dr. Emery, inventor of the transporter, conducts a long-range transporter experiment in order to recover his lost son.
No Pic "Observer Effect" January 21, 2005 1.7 2.76 411
Organians test the Enterprise crew by observing their reactions to a deadly silicon-based infection.
No Pic "Babel One" January 28, 2005 1.8 2.53 412
Andorians threaten war on Tellarites after apparently being attacked by a Tellarites vessel en route to trade talks.
No Pic "United" February 4, 2005 1.8 2.81 413
Archer and Shran engage in mortal combat to help unite Andorians and Tellarites.
No Pic "The Aenar" February 11, 2005 1.9 3.18 414
The drone Romulan ship that attacked the Andorians was under the control of an Aenar, an offshoot race of the Andorians.
No Pic "Affliction" February 18, 2005 2.0 3.17 415
Phlox kidnapped by Klingons to cure a disease caused by Klingon/Augment hybrids making them appear human; T'Pol's mental abilities grow exponentially.
No Pic "Divergence" February 25 1.9 2.96 416
Phlox continues to work on curing the lethal disease caused by Klingon/Augment hybrids while Trip lends a hand to the Enterprise to remove Klingon subroutines in the warp engine.
No Pic "Bound" April 15, 2005 0.0 0.00 417
Orion slave girls.
No Pic "In a Mirror, Darkly" April 22, 2005 0.0 0.00 418
Mirror Universe story.
No Pic "In a Mirror, Darkly Part II" April 29, 2005 0.0 0.00 419
No Pic "Demons" May 6, 2005 0.0 0.00 420
No Pic "Terra Prime" May 13, 2005 0.0 0.00 421
No Pic "These Are the Voyages..." May 13, 2005 0.0 0.00 422
Series finale.

The final two episodes of the season are scheduled to air the same night.

Story arcs

Star Trek: Enterprise relied upon story arcs more often than previous Trek series. The first two seasons had only two story arcs which reemerged sporadically, while the entire third season was a single arc that also included episodes from the second and fourth seasons. Beginning with the fourth season, the format of the series was altered so that the season featured a number of two- and three-episode arcs, which more than doubled the total number of arcs. A number of arcs overlap while some arcs set the scene for later arcs.

Arc storyline # of episodes Episodes
Andorians vs. Vulcans 5 107, 115, 123, 215, 409
Temporal Cold War 12 101, 102, 111, 126, 201, 216, 226, 311, 318, 324, 401, 402
The Xindi 27 226, 301-324, 401, 403
Augments 3 404, 405, 406
Surak's followers 4 403, 407, 408, 409
Romulan drone ships 3 412, 413, 414
Klingon Augments 2 415, 416
Birth of the Federation 14 101, 102, 107, 115, 215, 313, 318, 407, 408, 409, 412, 413, 414, 422

Andorians vs. Vulcans

These episodes chronicle the tensions existing between Vulcan and Andoria, two worlds that eventually put aside their differences and ally with Earth to form the United Federation of Planets.

# Title
107 "The Andorian Incident"
115 "Shadows of P'Jem"
123 "Fallen Hero"
215 "Cease Fire"
409 "Kir'Shara"

Temporal Cold War

An unidentified force from the 29th century is attempting to disrupt history through a Temporal Cold War. These episodes involve a time traveller from the 30th century, Daniels, who works with Archer and his crew to make sure history is not changed.

# Title
101
102		 "Broken Bow"
111 "Cold Front"
126 "Shockwave"
201 "Shockwave, Part II"
216 "Future Tense"
226 "The Expanse"
311 "Carpenter Street"
318 "Azati Prime"
324 "Zero Hour"
401 "Storm Front"
402 "Storm Front, Part II"

The Xindi

A mysterious space probe attacks Earth, killing 7 million people. After receiving information from individuals involved in the Temporal Cold War as to the origin of the weapon, the Enterprise NX-01 is assigned to enter a dangerous region of space to track down those responsible and prevent further attacks on Earth. This arc spanned an entire season and also overlapped into both the second and fourth seasons. The fourth season in particular sees Archer and his crew dealing with the fallout from the Xindi mission, with references to the event occurring in more episodes than are listed below.

# Title
226 "The Expanse"
301 "The Xindi"
302 "Anomaly"
303 "Extinction"
304 "Raijin"
305 "Impulse"
306 "Exile"
307 "The Shipment"
308 "Twilight"
309 "North Star"
310 "Similitude"
311 "Carpenter Street"
312 "Chosen Realm"
313 "Proving Ground"
314 "Stratagem"
315 "Harbinger"
316 "Doctor's Orders"
317 "Hatchery"
318 "Azati Prime"
319 "Damage"
320 "The Forgotten"
321 "E²"
322 "The Council"
323 "Countdown"
324 "Zero Hour"
401 "Storm Front"
403 "Home"

Augments

Genetically engineered humans created in the 20th century and nurtured by a brilliant but insane scientist hijack a Klingon vessel and attempt to rescue their adopted "father".

# Title
404 "Borderland"
405 "Cold Station 12"
406 "The Augments"

Surak's followers

Vulcan undergoes an upheaval as followers of Surak's principles try to overthrow the current government which is being secretly manipulated by the Romulans.

# Title
403 "Home"
407 "The Forge"
408 "Awakening"
409 "Kir'Shara"

Romulan drone ships

The Romulans use the mental abilities of an Andorian race called The Aenar to control a series of prototype, remote-controlled vessels designed to spark a war between Earth, Vulcan, Andorians, and the Tellarites.

# Title
412 "Babel One"
413 "United"
414 "The Aenar"

Klingon Augments

In this sequel to the human augments arc, the Klingons attempt to create their own genetically engineered race using Augment DNA from Dr. Soong's embryos. The result: a virus that is killing millions of Klingons and changing their appearance.

# Title
415 "Affliction"
416 "Divergence"

Birth of the Federation ("BOTF")

These episodes follow the early steps leading toward the creation of the United Federation of Planets. The arc incorporates elements of the Vulcan vs. Andorians arc, the Surak's follower's arc, and the Xindi arc.

# Title
101
102		 "Broken Bow"
107 "The Andorian Incident"
115 "Shadows of P'Jem"
215 "Cease Fire"
313 "Proving Ground"
318 "Azati Prime"
407 "The Forge"
408 "Awakening"
409 "Kir'Shara"
412 "Babel One"
413 "United"
414 "The Aenar"
422 "These Are the Voyages..."

It is rumored that the final three episodes of the fourth season will also be part of the "BOTF" arc, but this has yet to be confirmed.

See also

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