The Expanse: When a probe from an unknown alien source unleashes a devastating assault upon Earth, Enterprise is recalled, then sent to search for the perpetrators.
The Xindi: Captain Archer and his crew set out to gain information about the mysterious and antagonistic Xindi race.
Anomoly: Enterprise starts experiencing effects of the spatial distortions pervading the Delphic Expanse, and falls victim to predatory aliens.
Extinction: 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.
Rajiin: The NX-01 gets closer to a showdown with the Xindi when Captain Archer takes on an enigmatic passenger: a beautiful slave named Rajiin.
Impulse: 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.
Exile: A powerful telepath makes contact with Hoshi and offers to help Enterprise find the Xindi ... for a price.
The Shipment: 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.
Twilight: 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.
North Star: 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.
Similitude: When Trip suffers a catastrophic injury, his only hope for survival is a transplant from a "mimetic simbiot" which Phlox grows from one of his exotic creatures.
Carpenter Street: Archer and T'Pol travel back in time to 2004 Detroit to stop a Xindi plot.
Chosen Realm: A group of religious zealots hijack Enterprise intending to use it against the enemies of their faith.
Proving Ground: An Andorian ship led by Commander Shran arrives in the Delphic Expanse to help Enterprise hone in on the Xindi superweapon.
Stratagem: Archer finds himself face-to-face with Degra, the designer of the Xindi superweapon, and tries to trick him into revealing its location.
Harbinger: Enterprise rescues a dying alien from a colossal spatial anomaly, and he refuses to reveal why he was there. Meanwhile, tensions between Reed and Hayes heat up as new training drills begin.
Doctor's Orders: 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.
Hatchery: Enterprise finds a crashed Xindi-Insectoid ship containing an incubation chamber filled with Insectoid eggs. The crew must now decide whether to devote resources to save the offspring.
Azati Prime: Archer embarks on a suicide mission to destroy the Xindi's nearly completed planet-killing weapon.
Damage: While dissension among Xindi ranks festers, Enterprise tries to recover from a devastating attack.
The Forgotten: 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.
E2 (e-squared): An attempt to use a Xindi subspace corridor leads Enterprise to a bizarre encounter with another Starfleet ship.
The Council: Archer confronts the Xindi Council as T'pol and Major Hayes infiltrate an important sphere.
Countdown: plot is unknown so far.
