Season 1 - Episode Guide

In the early 22nd century, Captain Jonathan Archer commands a crew at the front lines of intergalactic upheaval as he takes command of the Enterprise, Earth's first warp-speed space vessel. For its maiden voyage, he volunteers to return a wounded Klingon to his home planet over the objections of Earth's Vulcan allies, who do not believe the humans are ready for interstellar travel.

Captain Archer takes command of Earth's first warp-speed space vessel and volunteers to return a wounded Klingon to his home planet over the objections of Earth's Vulcan allies, who do not believe the humans are ready for interstellar travel. The Enterprise discovers interference to destabilize the Klingon Empire by genetically-enhanced Suliban involved in a Temporal Cold War. 

As they continue their deep space exploration, the Enterprise crew grows restless after two weeks without contact with sentient life. But, they encounter an abandoned alien ship containing 15 humanoid corpses that were part of a scientific experiment. The horrific sight inspires Hoshi to panic and demand a return to Earth, but Archer insists on continuing the mission and finding out more about the abandoned dead. Trouble comes calling when the aliens conducting the gruesome experiments return and attack Captain Archer and his crew.

The Enterprise investigates an uninhabited Earthlike planet far more dangerous than expected. It proves irresistible to Trip, who persuades Archer to allow his survey team to camp overnight on the planet's surface, unaware of a gathering storm. The strong winds kick up pollen released by flowers that induce hallucinations and paranoia, infecting the crew members visiting the planet. After relocating into nearby caves, Trip, Mayweather, T'Pol, and two other crew members become convinced they are being watched.

After discovering the presence of a damaged Xyrillian vessel, Archer dispatches Trip to assist with its power source problems. He is delighted to have a friendly encounter with one of the ship's female engineers, but it has an unexpected side effect. After discovering that their special moment resulted in his becoming pregnant, he realizes he's had an unwitting experience with alien sex. Archer and his crew must then try and return the rapidly growing alien baby to its mother.
 

The Enterprise crew alters course to investigate the mystery of Terra Nova, a legendary deep-space Earth colony whose inhabitants mysteriously disappeared decades ago. But when they arrive, they encounter the descendants of the colonists who have become a tribe of human-hating cave-dwellers and more alien than Archer could ever have imagined.

Archer's curiosity about an ancient monastery unwittingly places his crew in the midst of a long-standing interstellar conflict between the Vulcans and their arch rivals, the Andorians.

The sudden appearance of a Vulcan starship disrupts Enterprise's probe of an unusual comet containing eisilium, a rare mineral. Trip discovers that T'Pol is transmitting coded messages to the Vulcan ship. After he learns the content of her communiqués, she reluctantly takes Trip into her confidence about her pending marriage on Vulcan. On their mission to the comet for core samples, Reed and Mayweather use explosives that unfortunately shift the comet's rotation. When the sun rises, the ice crumbles and traps them in a crevasse. Captain Archer reluctantly asks the Vulcans for help to use their tractor beam on the shuttle.

Disguised as locals, Archer and his expedition explore a civilization bedeviled by a virulent ailment possibly linked to a covert -- and anomalous -- nuclear reactor. Determined to find the truth, the captain teams up with a local apothecary, leading to a close encounter between the two.

After receiving a distress signal, Starfleet Command dispatches Enterprise to assist Fortunate, a human freight vessel attacked by Nausicaan pirates wounding the captain. On arriving, they are surprised that Fortunate's acting commander and crew are resistant to Archer's efforts to help them and determined to seek revenge against their attackers, no matter the repercussion

The Enterprise comes in contact with an alien vessel transporting stargazers to observe a spectacular stellar event. They are Borothan pilgrims who have come to see the Great Plume of Agosoria, a phenomenon their religion associates with the beginning of the universe. Archer invites them aboard the ship to witness it, not realizing that the Suliban agent Silik is among them. Archer quickly realizes that Silik is engaged in a nefarious time-traveling mission and must stop him before he can tamper with the course of history.

When an unidentified enemy vessel attacks Enterprise, Archer orders the ship's return to Jupiter Station for weapon upgrades. But, Reed, Tucker, and the crew work frantically to get their new phase cannons operational to meet this new threat. Meanwhile, Archer realizes no one knows Reed well enough to give him a personalized birthday gift. So, he orders Sato to investigate Reed's favorite food. 

The fascination with human behavior and culture expressed by Dr. Phlox in his letter to a peer is contrasted by his dissenting view of the crew's treatment of a dying alien race.

When Enterprise comes across a disabled Klingon vessel, Archer dispatches a shuttlepod with T'Pol, Hoshi, and Reed to investigate. There, a hostile female Klingon ambushes them and hijacks the shuttlepod, leaving the Enterprise crewmembers dangerously stranded aboard the Klingon vessel. Now it's up to Archer to take the Klingon under guard and enlist her help rescuing his crew. 

Archer and the crew are startled to discover the Vulcan High Command has ordered T'Pol to leave Enterprise and are equally frustrated at her seeming indifference about reassignment. However, T'Pol's last mission as a Starfleet officer proves eventful when a militant faction on Coridan, an alien planet, kidnaps her and Archer. Aid comes in the form of the mercurial Andorians: their leader, Shran, still owes Archer a debt (from the events of "The Andorian Incident"). The Vulcans are covertly backing the ruling faction on Coridan, while the Andorians are aiding the freedom fighters. With the help of the Andorians, Malcolm and Trip rescue Archer and T'Pol over the objections of the Vulcan ship retrieving T'Pol, and Shran considers his debt to Archer repaid.

Trip and Reed are dispatched on a shuttle mission to investigate an asteroid field and are cut off from Enterprise, thereby becoming convinced the starship has been destroyed and that their days are numbered.

En route to the eye-catching Arachnid Nebula, the crew encounters an obsolete Vulcan vessel manned by the Vahklas, a Vulcan sect that embraces emotional impulses. Despite her misgivings, T'Pol allows her curiosity about their lifestyle to get the best of her.

The crew explores a jungle planet that's been turned into a hunting ground by a race of stalkers called the Eska. They hunt indigenous creatures for recreation, one of which contacts Archer as a shadowy woman he imagined as a child. 

The Enterprise is invaded by Ferengi marauders, who knock out the crew with sleeping gas and pillage the ship for gold, equipment and slaves.

After hearing of a supposedly haunted alien ship on a desolate planet, Archer decides to cannibalize the wreck to replenish Enterprise's supplies and discovers the vessel is inhabited after all. While exploring the ship, the Enterprise crew encounters some ghostly apparitions and an alien race surviving despite insurmountable odds. Trip helps repair their derelict vessel and is befriended by Liana, an attractive humanoid alien who develops feelings for him.

While exploring a planet, Archer and Mayweather accidentally enter a "military zone" and are detained in an internment prison by an alien race called Tandarans, who are at war with the Suliban. While the Enterprise crew's previous encounters with the Suliban have been disastrous, Archer and Mayweather find themselves held with some Suliban detainees who they believe are wrongly imprisoned. This situation leads to a clash of wills between Archer and the Tandaran commandant.

Hoshi thinks she is to blame for a series of misunderstandings that sent a group of visiting aliens off the Enterprise in a huff. As the Kreetassans depart, a strange, symbiotic alien creature boards Enterprise capturing a few crew members, including Archer and Trip. This unidentifiable parasite cocoons them in its web, feeding off their bodies to survive. With the captured crewmembers' lives in jeopardy, an insecure Hoshi, under T'Pol's command, faces her biggest challenge by finding a way to communicate with the lifeform and persuade it to return to its home planet.

Duty interferes with the crew's first shore leave when the Enterprise is sent to the planet Mazar to fetch a distinguished Vulcan ambassador accused of criminal misconduct. The mission disturbs T'Pol, who's a great admirer of the diplomat.

When Archer and Trip repair a vessel belonging to an alien leader, the Earthmen are repaid with an invitation to their new friend's volatile world.

T'Pol talks Archer into joining the shore-leave party on the planet Risa, where he encounters a troubled alien beauty; Hoshi learns a new language from a local man; a pair of aliens take advantage of Trip and Reed; Dr. Phlox's hibernation is disrupted by Mayweather's injury.

Archer blames himself when the destruction of an alien colony prompts Starfleet to recall the Enterprise to Earth.