- 1 The Xindi
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Captain Archer and his crew set out to gain information about the mysterious and antagonistic Xindi race.
Air Date: 2003-09-10
- 2 Anomaly
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Enterprise starts experiencing effects of the spatial distortions pervading the Delphic Expanse, and falls victim to predatory aliens.
Air Date: 2003-09-17
- 3 Extinction
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On a mission to investigate an abandoned Xindi vessel on a jungle planet, Archer, Reed and Hoshi succumb to a virus that mutates them into a primal life form.
Air Date: 2003-09-24
- 4 Rajiin
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The NX-01 gets closer to a showdown with the Xindi when Captain Archer takes on an enigmatic passenger: a beautiful slave named Rajiin.
Air Date: 2003-10-01
- 5 Impulse
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When Enterprise responds to a distress call from a Vulcan ship stranded in the Delphic Expanse, Archer and his boarding team are attacked by insane zombie-like Vulcans.
Air Date: 2003-10-08
- 6 Exile
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A powerful telepath makes contact with Hoshi and offers to help Enterprise find the Xindi ... for a price.
Air Date: 2003-10-15
- 7 The Shipment
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Archer, Reed and Major Hayes infiltrate a Xindi-Sloth industrial colony to learn more about the weapon of mass destruction that will be used against Earth.
Air Date: 2003-10-29
- 8 Twilight
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A spatial distortion leaves Archer unable to form any new long-term memories. Years in the future, he wakes up one morning and is stunned to learn the outcome of the human-Xindi conflict.
Air Date: 2003-11-05
- 9 North Star
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When a settlement of humans living a 19th-century Western lifestyle is discovered on a Delphic Expanse planet, Archer and crew set out to learn how they got there.
Air Date: 2003-11-12
- 10 Similitude
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When Trip suffers a catastrophic injury, his only hope for survival is a transplant from a "mimetic symbiont" which Phlox grows from one of his exotic creatures.
Air Date: 2003-11-19
- 11 Carpenter Street
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Archer and T'Pol travel back in time to 2004 Detroit to stop a Xindi plot.
Air Date: 2003-11-26
- 12 Chosen Realm
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Religious zealots hijack Enterprise to use it as a weapon against the enemies of their faith.
Air Date: 2004-01-14
- 13 Proving Ground
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An Andorian ship led by Commander Shran arrives in the Delphic Expanse to help Enterprise hone in on the Xindi super-weapon.
Air Date: 2004-01-21
- 14 Stratagem
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Archer finds himself face-to-face with Degra, the designer of the Xindi superweapon, and tries to get him to reveal its location.
Air Date: 2004-02-04
- 15 Harbinger
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As Archer tries to unravel the mystery of a rescued alien, long-simmering feelings explode among his senior officers.
Air Date: 2004-02-11
- 16 Doctor's Orders
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The fate of Enterprise is in Dr. Phlox's hands as the rest of the crew must be induced into a coma in order to survive a trans-dimensional disturbance.
Air Date: 2004-02-18
- 17 Hatchery
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Archer goes to extreme lengths to save an abandoned nest of Xindi-Insectoid eggs ready to hatch.
Air Date: 2004-02-25
- 18 Azati Prime
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Archer sets out on a suicide mission to destroy the Xindi superweapon as Enterprise faces a brutal attack.
Air Date: 2004-03-03
- 19 Damage
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While dissension among Xindi ranks festers, Enterprise tries to recover from a devastating attack.
Air Date: 2004-04-21
- 20 The Forgotten
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Two high-ranking Xindi offer to stop the launch of their superweapon if Archer can prove they've been manipulated. Meanwhile, the crew mourns their lost mates.
Air Date: 2004-04-28
- 21 E²
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An attempt to use a Xindi subspace corridor leads the Enterprise crew to a bizarre encounter with their own descendants.
Air Date: 2004-05-05
- 22 The Council
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Archer and Hoshi stand before the Xindi Council as T'Pol and Reed lead a team into the heart of a Sphere.
Air Date: 2004-05-12
- 23 Countdown
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With help from Xindi allies, the Enterprise crew attempts to stop the arming of the Weapon aimed toward Earth.
Air Date: 2004-05-19
- 24 Zero Hour
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Archer puts his life on the line in a risky gambit to intercept the Xindi superweapon and disarm it from within.
Air Date: 2004-05-26