United: A marauder ship threatens to destabilise the region. Archer has a plan to capture it, but it'll mean unifying the Andorians, Tellarites and Vulcans. (S4, ep 13) [S]
Daedalus: Emory Erickson, Captain Archer's mentor and the man responsible for the transporter, boards Enterprise for a risky experiment. (S4, ep 10) [S]
Kir'shara: Archer, T'Pol and T'Pau attempt to bring the Kir'Shara - an artefact believed to contain Surak's original writings - to the Vulcan capital. (S4, ep 9) [S]
Awakening: Archer and T'Pol encounter the Syrrannites, a radical group hiding in the Vulcan desert, while the NX-01 crew contends with Vulcan power ploys. (S4, ep 8) [S]
The Forge: Earth's embassy on Vulcan is bombed, and the ensuing investigation puts Archer and T'Pol on the trail of a Vulcan religious faction hiding in a treacherous desert. (S4, ep 7) [S]
The Augments: In defiance of their 'father', Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to war. Guest starring Brent Spiner. (S4, ep 6) [S]
Cold Station 12: Arik Soong leads his band of Augments to a medical facility where hundreds of genetically enhanced embryos are still stored. Is he about to revive them? (S4, ep 5) [S]
Borderland: When genetic supermen left over from the Eugenics Wars hijack a Klingon ship, Archer must rely on their creator, the criminal Arik Soong, to hunt them down. (S4, ep 4) [S]
Home: The crew receive a heroes' welcome after returning to Earth following their year-long mission in the Delphic Expanse. Back on home turf, they take stock in different ways. (S4, ep 3) [S]
Storm Front, Part 2: As the Nazi invasion of the US continues in an altered 1944, Archer and his crew map out their strategy to stop Vosk from building a dangerous time machine. (S4, ep 2) [S]
Storm Front, Part 1: Season four opens with the crew trapped in an alternative 1944 - the Allied forces are losing WWII and the Nazis have invaded the USA (with alien help). [S]
Zero Hour: It's showtime. Captain Archer has tried every trick in the book to thwart the Xindi plot to destroy Earth, but has it all been in vain? Dazzling series three finale. (S3, ep 24) [S]
The Communicator: While retrieving his communicator from a pre-warp planet, Reed, along with Archer, is captured by soldiers who accuse them of being enemy spies. (S2, ep 8) [S]
Shockwave, Part 2: Archer is trapped in the 31st century, the Vulcans demand an end to Earth's space programme and Enterprise is one energise away from being overrun by Suliban. (S2, ep 1) [S]
Two Days And Two Nights: This week, Archer, Trip and Reed all have mysterious encounters with females who may not be all they appear. Meanwhile, Hoshi learns a new language. (S1, ep 25) [S]
Desert Crossing: Archer and Trip are invited to a desert-like planet by an alien leader, but discover he is a terrorist who has lured them there under false pretences. (S1, ep 24) [S]
Fallen Hero: When a Vulcan ambassador is accused of secretive criminal misconduct, Enterprise is asked to transport her back to the Vulcans. Trouble ensues. (S1, ep 23) [S]
Vox Sola: An alien invades the Enterprise, ensnaring the crew in its web and feeding off them for survival. Can Hoshi communicate with the creature before it's too late? (S1, ep 22) [S]
Detained: Archer and Mayweather enter a 'military zone' and are imprisoned by an alien race called Tandarans, who are at war with the Suliban. (S1, ep 21) [S]
Oasis: While exploring a crashed vessel, the Enterprise crew is haunted by some ghostly figures, and encounters an alien race which has survived despite insurmountable odds. (S1, ep 20) [S]
Acquisition: When the Ferengi, a group of intergalactic thieves, stun the Enterprise crew and try to rob the ship, it's up to Trip to work covertly to stop them. (S1, ep 19) [S]
Fusion: A group of atypical Vulcans visiting Enterprise subject T'Pol to uncomfortable new ideas, with one in particular urging her to release her own 'primal nature'. (S1, ep 17) [S]
Shuttlepod One: When Trip and Reed find themselves cut off from the Enterprise with no hope of rescue, they must overcome their differences to face their impending demise. (S1. ep 16) [S]
Shadows Of P'jem: The crew are disappointed to learn that T'Pol has been ordered to leave the Enterprise, even more so when they see her own indifference to leaving. (S1, ep 15) [S]
Sleeping Dogs: When the crew enter a wounded Klingon vessel, they are ambushed by a Klingon and left stranded on the sinking ship with Archer their only hope for survival. (S1, ep 14) [S]
Silent Enemy: Attacked by an unidentified enemy ship, the crew struggles to get their new phase cannons operational. Meanwhile, Archer endeavours to give Reed a happy birthday. (S1, ep 12) [S]
Civilization: On an Earth-like planet, Archer helps a primitive scientist to work out what is killing the townspeople - and he has his first kiss with an alien. (S1, ep 9) [S]
Breaking The Ice: Trip learns that T'Pol has been transmitting secret messages to a nearby Vulcan ship, and Archer attempts to save two crewmen from a disintegrating comet. (S1, ep 8) [S]
The Andorian Incident: Archer and his crew encounter hostile, paranoid aliens when they visit a Vulcan monastery and discover it has been taken over by the Andorians. (S1, ep 7) [S]
Terra Nova: The crew investigate Terra Nova, a mysterious human colony in outer space, but when they arrive they find the inhabitants have evolved far beyond human parameters. [S]
Unexpected: After sharing a friendly moment with the female engineers of an alien ship, Trip discovers that he's just had his first experience with alien sex and is now pregnant! [S]
Strange New World: On an Earth-like planet, the crew become infected with powerful hallucinogens. Can Archer save them before the ensuing paranoia causes a tragedy? [S]
Broken Bow, Part 2: Enterprise is on its first deep space mission when the Suliban kidnap the Klingon they are transporting, forcing Archer to make a detour. [S]
Broken Bow, Part 1: During the first ever episode, the Enterprise crew sets out on its maiden voyage with a mission to return a wounded Klingon to his people. [S]
These Are The Voyages: The crew faces one last mission: to save Commander Shran's kidnapped daughter. An emotional final episode that marks the end of Star Trek as we know it. (S4, ep 22) [S]
In A Mirror Darkly, Part 2: In the mirror universe, Archer commandeers the 23rd-century ship Defiant and uses it in a nefarious power grab. (S4, ep 19) [S]
In A Mirror Darkly, Part 1: The 700th episode of Star Trek sees Archer in a mirror universe, where he mutinies against the captain of an amoral version of the Enterprise crew. (S4, ep 18) [S]
Affliction: Dr Phlox is kidnapped and forced to help the Klingons deal with a grave threat against their species. James Avery (The Fresh Prince Of Bel Air) guest stars. (S4, ep 15) [S]
United: A marauder ship threatens to destabilise the region. Archer has a plan to capture it, but it'll mean unifying the Andorians, Tellarites and Vulcans. (S4, ep 13) [S]