Mayweather temporarily leaves Enterprise to visit the cargo ship Horizon, where he was born and raised. Meanwhile, the Enterprise crew observes an unusual planetary event.
2 | 21
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The Breach (23 Apr. 2003)
At Dr. Phlox's request, Enterprise attempts to retrieve 3 Denobulan scientists from the planet Xantoras, where the Goverment has ordered all off-worlders to evacuate within 3 days. Tucker, Reed, and Mayweather navigate a series of labyrinthine underground caves in search of the scientists. Meanwhile, Enterprise lends assistance to a damaged ship fleeing the planet. Doctor Phlox faces an ethical dilemma when one of the refugees of the ship refuses life-saving treatment. The patient, an Antaran, holds a grudge against Phlox stemming from a war between their races that ...
2 | 22
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Cogenitor (30 Apr. 2003)
Enterprise encounters a hyper-giant star. While there, they make first contact with the Vissians, a technologically sophisticated race with three genders. While making quick friends, and eagerly learning about the advanced technology, Trip gets curious about the Vissians third gender, known as the Cogenitor, who is crucial in the Vissian reproductive process. Against the wishes of the Vissians, Trip befriends the Cogenitor and encourages it to defy its cultural boundaries, which the Vissians are made aware of, and are angered by.
2 | 23
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Regeneration (7 May 2003)
Borg casualties from a century earlier are re-animated by a research team. Enterprise is ordered to intercept them before they can escape in their commandeered ship.
2 | 24
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First Flight (14 May 2003)
After his close friend and colleague A.G. Robinson is killed in a mountain climbing accident, Captain Archer tells T'Pol about the Warp 2 test flight almost ten years earlier.
2 | 25
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Bounty (14 May 2003)
After exploring an uninhabited planet, Captain Archer is taken prisoner by a Tellarite bounty hunter who was hired by the Klingons to return Archer to Qo'noS.
2 | 26
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The Expanse (21 May 2003)
An unknown probe fires on Earth from space, cutting a swath from Florida to Venezuela. Everything in the path of the attack was destroyed, resulting in the deaths of seven million humans including Tucker's younger sister Elizabeth. Enterprise is recalled to Earth for upgrades to the ship and to take on military crewmen. Silik gives Archer a message from the future about Earth's latest enemy. The Klingon Empire gives Duras another chance to capture Archer. Enterprise heads for infamous and dangerous Delphic Expanse.
3 | 1
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The Xindi (10 Sep. 2003)
Enterprise has been in the Delphic Expanse for six weeks and have yet to get any intel about the Xindi. Strange anomalies affect the ship, sending cargo flying violently through the bays, pockets of atmosphere losing gravity and other incidents defying the known laws of physics. T'Pol helps Trip's insomnia with an intimate Vulcan therapy. Archer and Trip find another race of Xindi imprisoned in a mine.
3 | 2
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Anomaly (17 Sep. 2003)
After an attack by Osaarian pirates, Enterprise follows them to a mysterious sphere.
3 | 3
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Extinction (24 Sep. 2003)
Archer, Reed and Sato are transformed into aliens while visiting a planet.
3 | 4
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Rajiin (1 Oct. 2003)
Enterprise helps an alien woman, Rajiin, seeking to escape her life as a sex slave. Once on board she uses her alien abilities to gather biometric data about humans and is recaptured by her employers, the Xindi council.
3 | 5
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Impulse (8 Oct. 2003)
Enterprise answers a distress signal from a stranded Vulcan ship, only when arriving they find the ship completely desolate, wrecked - and filled with Vulcan zombies.
3 | 6
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Exile (15 Oct. 2003)
Hoshi Sato is contacted by a 400-year-old telepathic alien exiled on planet in the Expanse, shunned by his society because of his abilities. The alien offers to use his powers to help Enterprise find the Xindi and the weapon they are building, but only if Hoshi will stay with him while he works. She agrees to stay behind, while Enterprise confirms the Expanse has a second Sphere and is on its way to investigate.
3 | 7
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The Shipment (22 Oct. 2003)
Enterprise follows a lead and discovers a Xindi lab that refines Kemocite, the key ingredient in the weapon being built to destroy Earth. An away team of Archer, Reed and Hayes confront the lead researcher, Gralik Durr, who was employed by Degra to refine the Kemocite but was never told what it would be used for. When Gralik realizes it was his research that contributed to the 7 million deaths on Earth, he agrees to help Archer prevent further loss of life. Meanwhile, on Enterprise, Phlox and Tucker study the weapon they seized from the Xindi and find an organic ...
3 | 8
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Twilight (5 Nov. 2003)
Enterprise is hit with a rather intense anomaly. Refusing to leave an injured T'Pol behind, Archer is struck by the anomaly, leaving his brain infected with parasites, preventing him from making any new memories. Fast-forward 12 years. T'Pol has been caring for Archer since his affliction. As she does every day, T'Pol catches Archer up on the past 12 years, knowing he will forget everything within hours. She was in command of Enterprise after his injury, that the parasites live outside normal space-time and usual remedies never worked, that the Xindi were successful, ...
3 | 9
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North Star (12 Nov. 2003)
Enterprise investigates a previously unknown colony of humans who are living in the fashion of the American Old West. They are oppressing an alien race called the Skagarans.
3 | 10
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Similitude (19 Nov. 2003)
Archer decides to make a fast-growing clone of Trip to help save his life while Enterprise is stranded in a dangerous field with nucleonic particles.
3 | 11
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Carpenter Street (26 Nov. 2003)
Archer and T'Pol travel back in time to Detroit in 2004 to stop three Xindi-Reptilians from constructing a bioweapon.
3 | 12
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Chosen Realm (14 Jan. 2004)
Enterprise is taken over by religious zealots who want to use the ship in a war against heretics.
3 | 13
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Proving Ground (21 Jan. 2004)
Enterprise has found the location of the testing site of the Xindi weapon and gets some rather unexpected help.
3 | 14
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Stratagem (4 Feb. 2004)
Archer and the Xindi Degra are in a shuttle. With Degra suffering from memory loss, Archer tells him they escaped together from a prison and that the Insectoids took power after destroying Earth.
3 | 15
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Harbinger (11 Feb. 2004)
With Reed and Hayes fighting over a training program and Trip seemingly making T'Pol jealous, Enterprise discovers a dying alien in a pod with technology similar to the Spheres.
3 | 16
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Doctor's Orders (18 Feb. 2004)
While in command of Enterprise because the entire crew is in a coma, Dr. Phlox starts hearing some strange sounds.
3 | 17
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Hatchery (25 Feb. 2004)
Captain Archer orders the crew of Enterprise to save a Xindi-Insectoid hatchery.
3 | 18
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Azati Prime (3 Mar. 2004)
Archer decides he should pilot a kamikaze shuttle to destroy the Xindi weapon. Temporal agent Daniels urges him to reconsider.
3 | 19
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Damage (21 Apr. 2004)
Captain Archer has been returned to Enterprise by the Xindi council awaiting a hearing. But after a heavy attack by the Reptilians, Enterprise is stranded without a functional warp drive. They meet another ship in trouble because of space anomalies. The ship's captain isn't willing to trade in their warp coil and Archer must make a tough decision. Meanwhile T'Pol is having some strange sensations and can't control her emotions.
3 | 20
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The Forgotten (28 Apr. 2004)
Enterprise has arrived on time for the appointment with Degra. Captain Archer invites them to their ship, while he does his best to convince both Degra and Jannar that the destruction of Earth is actually part of the grand scheme of the sphere builders to conquer the universe. While Jannar remains reluctant, Degra seems to be slightly won over. Trip Tucker is having a hard time keeping Enterprise in shape and is also having difficulties with writing a letter to the parents of crewman Taylor, informing of her death. Then trouble arises when out of the blue a Reptilian ...
3 | 21
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E² (5 May 2004)
Trying to pass through a subspace corridor, Enterprise is stopped by a version of itself from the future.
3 | 22
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The Council (12 May 2004)
Enterprise has arrived at the location of the Xindi Council and with the help of Degra, Archer can make his plea in front of the five races of Xindi. Archer needs to prove that the Sphere Builders have been telling lies. While the Primates and Arboreals are already aware of the truth, convincing the other three races will not be easy. The Reptilians and Insectoids refuse to even listen to Archer. Meanwhile, the Sphere Builders haven't been sitting still, and have arranged a secret meeting with the Reptilians.
3 | 23
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Countdown (19 May 2004)
While the Reptilians force Hoshi to decipher a launch code, the Primates, Arboreals and Archer think of a way to stop the Xindi weapon.
3 | 24
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Zero Hour (26 May 2004)
Archer takes Degra's ship to try to prevent Earth from being destroyed and gets some unexpected help. Enterprise tries to destroy Sphere 41, but the Sphere Builders know about the plan.
4 | 1
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Storm Front (8 Oct. 2004)
Following the destruction of the Xindi weapon, the Enterprise crew discovers that they have been sent back in time to 1944. However, history has been altered, leaving Nazi Germany in control of a large portion of the eastern United States.
4 | 2
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Storm Front, Part II (15 Oct. 2004)
After Silik attacks Trip, Vosk wants to make a deal with Archer: supplies of the ship for the completion of his time machine in return for a trip to the 22nd Century.
4 | 3
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Home (22 Oct. 2004)
The crew take some time off. Archer meets an old friend, Captain Erika Hernandez. T'Pol takes Trip to Vulcan, with a surprise waiting. Phlox finds out Earth has become xenophobic.
4 | 4
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Borderland (29 Oct. 2004)
After a Klingon ship is attacked, it's discovered the imprisoned Dr. Soong's genetically enhanced humans are responsible. Archer takes him to prevent a war.
4 | 5
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Cold Station 12 (5 Nov. 2004)
The Augments are on their way to Cold Station 12, where Augments embryos are kept.
4 | 6
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The Augments (12 Nov. 2004)
The Augments have yet again escaped. While Dr. Soong wants to hide the embryos, Malik has an entirely different and way more cruel plan.
4 | 7
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The Forge (19 Nov. 2004)
After a bombing destroyed the Earth embassy on Vulcan, a group known as the Syrrannites are suspected. T'Pol receives a map from her Syrrannite mother, leading into a dangerous desert, the Forge.
4 | 8
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Awakening (26 Nov. 2004)
T'Pol and Archer confront the Syrrannites and meet T'Pau who denies the embassy bombing. Archer, who has Surak's essence, is asked to help. V'Las threatens Enterprise to make sure an attack on the Syrrannites isn't witnessed.
4 | 9
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Kir'Shara (3 Dec. 2004)
While Enterprise travels to Andoria to warn them of the attack, Archer tries to bring the Kir'Shara to the High Command.
4 | 10
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Daedalus (14 Jan. 2005)
Dr. Emory Erickson comes aboard to supposedly conduct tests for subquantum transportation. However, he seems to have a different agenda.
4 | 11
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Observer Effect (21 Jan. 2005)
Noncorporeal aliens inhabit the bodies of Enterprise crew members to study how the crew reacts to a lethal virus infection that has afflicted Trip and Hoshi.
4 | 12
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Babel One (28 Jan. 2005)
Enterprise escorts Tellarites to peace talks with Andorians. While transporting they rescue Andorians and say the Tellarites attacked them. Enterprise is soon attacked by an Andorian ship, and Archer must prove who is responsible.
4 | 13
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United (4 Feb. 2005)
Captain Archer must convince Vulcans, Tellarites and Andorians to unite to find the Romulan ship.
4 | 14
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The Aenar (11 Feb. 2005)
Enterprise finds out the marauder was piloted telepathically by an Aenar, a subspecies from Andoria.
4 | 15
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Affliction (18 Feb. 2005)
While Enterprise is visiting Earth, Phlox is abducted by the Klingons and forced to research a cure for a virus destined to wipe out the race. Reed is tapped by a secret agency and ordered to betray Archer. Trip transfers to the Columbia.
4 | 16
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Divergence (25 Feb. 2005)
While Enterprise tries to bring Trip on board to reverse the malicious Klingon modifications, Phlox and Antaak find a cure for the virus that will not please General K'Vagh.
4 | 17
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Bound (15 Apr. 2005)
The men of Enterprise fall under the seductive control of three Orion women. Trip is the only male member of the crew not to succumb to the women.
4 | 18
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In a Mirror, Darkly (22 Apr. 2005)
In the mirror universe, the crew of the ISS Enterprise is fighting rebels who oppose the Terran Empire when they discover the Tholians have captured a vessel from the future.
4 | 19
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In a Mirror, Darkly, Part II (29 Apr. 2005)
After capturing a Constitution class starship from the future, the Captain Archer of the mirror universe attempts to become Emperor.
4 | 20
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Demons (6 May 2005)
While attending a conference on a proposed interplanetary alliance, Trip and T'Pol find out from a dying woman that they have a baby. Investigation shows the woman was a member of the xenophobic organization Terra Prime.
4 | 21
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Terra Prime (13 May 2005)
Paxton threatens to destroy Starfleet Headquarters if all aliens don't leave Earth. Enterprise must shut down the verteron array on Mars, but it is extremely well defended.
4 | 22
- These Are the Voyages... (13 May 2005)
In 2370, Commander William T. Riker is trying to clear his mind and relives the last mission of the first Enterprise on the holodeck.