Series 1966–1969 ·3 seasons ·79 episodes ·Set 2265–2269

Star Trek: The Original Series

Captain Kirk, Spock and the crew of the USS Enterprise on a five-year mission of exploration. The series that started it all.

Episode guide

Season 1 29 logged

01 The Man TrapA creature that feeds on salt impersonates a former love of Dr. McCoy and stalks the crew of the Enterprise. Sep 8, 1966 02 Charlie XA teenager raised alone with extraordinary powers cannot cope with human society, and the Enterprise pays for… Sep 15, 1966 03 Where No Man Has Gone BeforeExposure to the galactic barrier gives Gary Mitchell godlike abilities, forcing Kirk to confront his oldest f… Sep 22, 1966 04 The Naked TimeA contagion strips away the crew's inhibitions while the Enterprise races to avoid a collapsing planet. Sep 29, 1966 05 The Enemy WithinA transporter malfunction splits Kirk into a gentle half and a savage half, neither able to command alone. Oct 6, 1966 06 Mudd's WomenA smooth-talking smuggler delivers three remarkable women to lonely miners, and Kirk learns the secret of the… Oct 13, 1966 07 What Are Little Girls Made Of?On a frozen world Nurse Chapel searches for her fiancé and finds androids who want to replace the crew. Oct 20, 1966 08 MiriThe crew finds a duplicate Earth where only children survive, and a disease is killing the landing party. Oct 27, 1966 09 Dagger of the MindAn escaped inmate from a penal colony reveals that its director is experimenting on his patients. Nov 3, 1966 10 The Corbomite ManeuverAn enormous alien vessel threatens destruction, and Kirk answers with the best bluff in Starfleet history. Nov 10, 1966 11 The MenagerieSpock steals the Enterprise to deliver the crippled Captain Pike to a forbidden world, and a court-martial re… Nov 17, 1966 12 The Menagerie, Part IISpock's court-martial concludes as the truth behind his hijacking of the Enterprise to Talos IV comes into vi… Nov 24, 1966 13 The Conscience of the KingKirk suspects a travelling actor is a mass murderer from his past on Tarsus IV. Dec 8, 1966 14 Balance of TerrorA Romulan warship tests the Neutral Zone in a tense submarine-style duel with the Enterprise. Dec 15, 1966 15 Shore LeaveOn an idyllic planet the crew's memories and fantasies become real, with sometimes lethal results. Dec 29, 1966 16 The Galileo SevenSpock commands a stranded shuttlecraft crew and discovers how difficult command by logic really is. Jan 5, 1967 17 The Squire of GothosA powerful being who plays at being a nobleman toys with Kirk and his officers. Jan 12, 1967 18 ArenaKirk is forced to fight the captain of a Gorn vessel in single combat, with a whole sector as the prize. Jan 19, 1967 19 Tomorrow Is YesterdayThe Enterprise is flung back to the twentieth century and must retrieve an Air Force pilot without altering h… Jan 26, 1967 20 Court MartialKirk faces a court-martial over the apparent death of a crewman, until it emerges that the man faked his own … Feb 2, 1967 21 The Return of the ArchonsThe landing party finds a world governed by a computer, Landru, and a placid society that erupts each night. Feb 9, 1967 22 Space SeedThe crew revives a group of genetically engineered tyrants led by Khan Noonien Singh. Feb 16, 1967 23 A Taste of ArmageddonTwo planets fight a war by computer, and the casualties report voluntarily to disintegration chambers. Feb 23, 1967 24 This Side of ParadiseSpores on a colony planet bring peace and contentment, and even Spock falls under their spell. Mar 2, 1967 25 The Devil in the DarkMiners on Janus VI are being killed by a creature that turns out to be a mother protecting her eggs. Mar 9, 1967 26 Errand of MercyThe first meeting with the Klingons ends with two empires being told to stand down by a people they thought h… Mar 23, 1967 27 The Alternative FactorA man claims to be hunting a madman, and the universe itself seems to wobble at the edges. Mar 30, 1967 28 The City on the Edge of ForeverKirk and Spock travel to Depression-era New York to repair a change in history that begins with a woman named… Apr 6, 1967 29 Operation -- Annihilate!Parasitic creatures spreading across the galaxy take over Kirk's brother's colony and threaten his crew. Apr 13, 1967

Season 2 26 logged

01 Amok TimeSpock's pon farr forces the Enterprise to Vulcan, where he must fight Kirk or die. Sep 15, 1967 02 Who Mourns for Adonais?A being claiming to be Apollo demands the worship of the crew and meets resistance. Sep 22, 1967 03 The ChangelingAn ancient probe, Nomad, believes Kirk is its creator and sets out to sterilise imperfection. Sep 29, 1967 04 Mirror, MirrorA transporter accident sends Kirk and others to a brutal parallel universe where the Federation is an empire. Oct 6, 1967 05 The AppleA tropical planet's inhabitants are tended by a machine, Vaal, that regards the Enterprise as a threat. Oct 13, 1967 06 The Doomsday MachineA planet-killing weapon has destroyed a starship and now bears down on the Enterprise. Oct 20, 1967 07 CatspawTwo aliens in a spooky castle terrorise the landing party in order to understand human fear. Oct 27, 1967 08 I, MuddHarry Mudd has set himself up as ruler of a planet of androids and plans to hand the Enterprise over to them. Nov 3, 1967 09 MetamorphosisA shuttle crash strands Kirk's party with a reclusive scientist and a luminous entity that loves him. Nov 10, 1967 10 Journey to BabelA conference of ambassadors becomes a murder mystery, and Spock must reckon with his father. Nov 17, 1967 11 Friday's ChildA Federation mission to a warrior planet gets tangled in tribal succession and a pregnant widow. Dec 1, 1967 12 The Deadly YearsAging rapidly after a planetary visit, the senior officers cannot be trusted with the ship. Dec 8, 1967 13 ObsessionKirk becomes fixated on a vapour creature that killed part of his old crew. Dec 15, 1967 14 Wolf in the FoldScotty is accused of murdering women, and an ancient entity is feeding on fear. Dec 22, 1967 15 The Trouble with TribblesA small, fast-breeding creature invades the Enterprise and a space station in the middle of a grain dispute. Dec 29, 1967 16 The Gamesters of TriskelionKirk, Uhura and Chekov are abducted to be gladiators for the amusement of disembodied rulers. Jan 5, 1968 17 A Piece of the ActionThe crew visits a planet whose culture was modelled on an Earth book about 1920s gangsters. Jan 12, 1968 18 The Immunity SyndromeA giant space amoeba drains the life from stars, and Spock volunteers for a likely one-way mission. Jan 19, 1968 19 A Private Little WarKirk faces a decision about arming a primitive people when the Klingons already have. Feb 2, 1968 20 Return to TomorrowAncient disembodied beings borrow the bodies of Kirk, Spock and Dr. Ann Mulhall for a deadly purpose. Feb 9, 1968 21 Patterns of ForceA historian's well-intentioned experiment has turned a society into a copy of Nazi Germany. Feb 16, 1968 22 By Any Other NameThe Kelvans, visitors from another galaxy, take over the Enterprise for a long voyage home. Feb 23, 1968 23 The Omega GloryKirk finds a rogue starship captain meddling in a war between two peoples on Omega IV, a world whose history … Mar 1, 1968 24 The Ultimate ComputerAn experimental computer designed to run the ship goes rogue and takes aim at other Starfleet vessels. Mar 8, 1968 25 Bread and CircusesA planet where Rome never fell treats Kirk and his officers as gladiators and prisoners. Mar 15, 1968 26 Assignment: EarthA time-travelling operative, Gary Seven, intercepts the Enterprise in 1968 and entangles it in a rocket launc… Mar 29, 1968

Season 3 24 logged

01 Spock's BrainAliens steal Spock's brain and the crew must retrieve it, with McCoy temporarily guiding the body. Sep 20, 1968 02 The Enterprise IncidentKirk apparently orders a violation of Romulan space, in a scheme to steal a cloaking device. Sep 27, 1968 03 The Paradise SyndromeKirk loses his memory and lives among a tribe descended from Native Americans while the Enterprise tries to d… Oct 4, 1968 04 And the Children Shall LeadA group of children is manipulated by an evil entity into taking over the ship. Oct 11, 1968 05 Is There in Truth No Beauty?A Medusan ambassador is carried aboard in a box, and his form can drive observers mad. Oct 18, 1968 06 Spectre of the GunThe landing party is forced into a re-creation of the gunfight at the O.K. Corral. Oct 25, 1968 07 Day of the DoveAn energy being that feeds on hatred sets the Klingons and the crew against each other. Nov 1, 1968 08 For the World Is Hollow and I Have Touched the SkyDr. McCoy discovers he is dying and finds that an asteroid is actually a generational ship. Nov 8, 1968 09 The Tholian WebKirk disappears into a spatial interphase while the crew is slowly affected by a mysterious force. Nov 15, 1968 10 Plato's StepchildrenTelekinetic humanoids on Platonius torment the crew for sport. Nov 22, 1968 11 Wink of an EyeAccelerated aliens, the Scalosians, take over the ship by moving too fast to see. Nov 29, 1968 12 The EmpathKirk, Spock and McCoy are tested by aliens who want to know if a mute woman's species is worth saving. Dec 6, 1968 13 Elaan of TroyiusThe Enterprise ferries a spoiled but dangerous princess to a political marriage as Klingon ships close in. Dec 20, 1968 14 Whom Gods DestroyA once-great Starfleet hero is a patient in an asylum where inmates have taken control. Jan 3, 1969 15 Let That Be Your Last BattlefieldTwo beings from the same world who hate each other over their skin colour carry their war aboard the Enterpri… Jan 10, 1969 16 The Mark of GideonA planet with no disease and no deaths appears to have kidnapped Kirk. Jan 17, 1969 17 That Which SurvivesA woman's image kills crew members as the Enterprise is flung beyond known space. Jan 24, 1969 18 The Lights of ZetarA group of energy beings attempts to take over Lt. Mira Romaine, a memory-alpha specialist. Jan 31, 1969 19 Requiem for MethuselahDuring a deadly epidemic, Kirk meets an immortal recluse named Flint on a remote planet and falls in love wit… Feb 14, 1969 20 The Way to EdenSpace hippies searching for a mythical planet steal a shuttle and trigger a chain of disasters. Feb 21, 1969 21 The Cloud MindersA city above the clouds has a class system that depends on a mineral gas that makes the underclass dull. Feb 28, 1969 22 The Savage CurtainAbraham Lincoln and Surak appear to help Kirk and Spock fight historical villains on a rocky planet. Mar 7, 1969 23 All Our YesterdaysA time portal leaves Kirk, Spock and McCoy stranded in different eras of a dying planet. Mar 14, 1969 24 Turnabout IntruderA former lover of Kirk uses a machine to switch bodies with him and seize command of the ship. Jun 3, 1969