The Cage
0x01
While investigating a distress call from Talos IV, Captain Christopher Pike of the starship Enterprise is captured and tested by beings who can project powerfully realistic illusions. (Original pilot)
WikiPilot
Season 1
Where No Man Has Gone Before
1x01
An encounter at the limits of our galaxy begins to change Lieutenant Commander Gary Mitchell and threatens the future of the Enterprise and the Human race itself. (Second pilot)
WikiThe Corbomite Maneuver
1x02
Exploring a distant region of space, the Enterprise is threatened by Balok, commander of a starship from the First Federation.
WikiMudd's Women
1x03
The Enterprise rescues a con man named Harry Mudd who is trafficking in mail-order brides.
WikiThe Enemy Within
1x04
A transporter malfunction splits Captain Kirk into two people – one good and one evil, and neither capable of functioning well separately.
WikiThe Man Trap
1x05
A mysterious creature stalks the Enterprise, murdering crew members. (Series Premiere/Franchise Debut)
WikiThe Naked Time
1x06
The Enterprise crew is intoxicated by an inhibition-stripping contagion that causes mayhem throughout the ship.
WikiCharlie X
1x07
The Enterprise takes seventeen-year-old Charles Evans aboard for transport after he spent fourteen years alone on a deserted planet, but his inability to reintegrate with his fellow Humans is compounded by his very un-Human powers.
WikiBalance of Terror
1x08
The Enterprise battles a Romulan ship suspected of destroying outposts near the Neutral Zone.
WikiWhat Are Little Girls Made Of?
1x09
The Enterprise finds archaeologist Dr. Roger Korby, who has been missing for five years, living underground on a deserted ice planet with a group of sophisticated androids.
WikiDagger of the Mind
1x10
A routine visit to the Tantalus Penal Colony proves dangerous for Kirk and an Enterprise psychiatrist.
WikiMiri
1x11
The Enterprise discovers an Earth-like planet that was devastated by a horrific degenerative disease and is now populated entirely by impossibly old children.
WikiThe Conscience of the King
1x12
An actor traveling aboard the Enterprise may be a former governor who ordered a mass murder twenty years earlier.
WikiThe Galileo Seven
1x13
Spock faces difficult command decisions when his shuttle crashes on a hostile world populated by barbarous giants.
WikiCourt Martial
1x14
Kirk is accused of criminal negligence causing the death of one of his subordinates, Lt. Commander Benjamin Finney, and is put on trial for his murder.
WikiThe Menagerie, Part I
1x15
Spock fakes a message from the Enterprise's former commander, Christopher Pike, steals the vessel, and sets it on a locked course for the forbidden planet Talos IV.
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While Spock faces court martial for kidnapping Captain Pike and hijacking the Enterprise, he further explains his actions with mysterious footage about Pike's captivity by the Talosians.
WikiShore Leave
1x17
The Enterprise crew take shore leave on a planet where their imaginations become reality.
WikiThe Squire of Gothos
1x18
The Enterprise is captured by Trelane, the childish ruler of Gothos.
WikiArena
1x19
Kirk battles an alien captain who destroyed a Federation outpost.
WikiThe Alternative Factor
1x20
Investigating the cause of a massive, galaxy-wide disruption in space, the Enterprise finds a mad scientist who claims he is being pursued by a hideous being.
WikiTomorrow is Yesterday
1x21
The Enterprise is hurled back in time to the year 1969, where the US Air Force sights it as a UFO. The crew must find a way to erase evidence of their visit before trying to get back to their future home.
WikiThe Return of the Archons
1x22
The Enterprise discovers a planet where the population act like zombies and obey the will of their unseen ruler, Landru.
WikiA Taste of Armageddon
1x23
On a diplomatic mission, the crew visit a planet that is waging a destructive war fought solely by computer simulation, but the casualties, including the crew of the USS Enterprise, are supposed to be real.
WikiSpace Seed
1x24
The Enterprise discovers an ancient spaceship carrying genetically enhanced supermen from late 20th century Earth and their enigmatic warlord leader: Khan Noonien Singh.
WikiThis Side of Paradise
1x25
The Enterprise crew finds happiness at a colony where alien spores provide total contentment.
WikiThe Devil in the Dark
1x26
The Enterprise arrives at Janus VI, where an unknown monster is destroying machinery and killing the miners, threatening the entire mining operation.
WikiErrand of Mercy
1x27
Kirk and Spock try to protect the planet Organia from the Klingons, but the natives don't want the Federation's help.
WikiThe City on the Edge of Forever
1x28
Suffering from an accidental overdose of cordrazine, Doctor Leonard McCoy goes back to 1930s Earth and saves a woman's life, unwittingly changing the course of time and erasing the Enterprise and the Federation from history.
WikiOperation -- Annihilate!
1x29
The Deneva colony is attacked by flying parasites that cause mass insanity while the crew of Enterprise search for a way to stop them. (Season finale)
WikiSeason 2
Catspaw
2x01
The Enterprise crew finds witches, black cats, and haunted castles on a distant planet.
WikiMetamorphosis
2x02
On an isolated asteroid, Kirk finds Zefram Cochrane, inventor of the warp drive, who has been missing for 150 years.
WikiFriday's Child
2x03
The Enterprise becomes involved in a local power struggle on planet Capella IV, where the Klingons want mining rights.
WikiWho Mourns for Adonais?
2x04
The Enterprise is captured by an alien claiming to be Apollo, the Greek god of the sun.
WikiAmok Time
2x05
Suffering through his first infliction of pon farr, the Vulcan biological mating urge, Spock must return to Vulcan to marry his betrothed or he will die. However, when the Enterprise arrives at Vulcan, complications at the ceremony may endanger Captain Kirk as well. (Season Premiere)
WikiThe Doomsday Machine
2x06
The Enterprise discovers a weapon capable of destroying entire planets, and a Starfleet flag officer whose crew was killed by the machine jeopardizes the crew on a crazed mission of revenge.
WikiWolf in the Fold
2x07
Scott is suspected of killing several women while on shore leave on Argelius II. However, a more sinister force may provide a connection between this murder and many previous around the galaxy, including a rampage on ancient Earth.
WikiThe Changeling
2x08
The Enterprise finds an ancient interstellar probe from Earth, missing for 265 years, which has somehow mutated into a powerful and intelligent machine bent on sterilizing entire populations that do not meet its standards of perfection.
WikiThe Apple
2x09
The Enterprise crew discovers an Eden-like paradise on Gamma Trianguli VI, controlled by a machine that is revered by the local humanoid primitives as a god.
WikiMirror, Mirror
2x10
A transporter malfunction sends Kirk, McCoy, Scotty, and Uhura into a parallel universe where the Federation is replaced by an evil Empire, Kirk is a despot, and Spock is a cunning henchman.
WikiThe Deadly Years
2x11
The Enterprise discovers a colony full of rapidly-aging scientists. Whatever caused the rapid aging afflicts the ship´s landing party as well. Kirk, Spock, McCoy, and Scott are shocked to discover they are aging decades each day and will soon die unless a cure can be found. The unaffected Chekov may be their only hope for survival.
WikiI, Mudd
2x12
Harry Mudd, now ruler of a planet of androids, captures the Enterprise and attempts to imprison Kirk for revenge.
WikiThe Trouble with Tribbles
2x13
A dispute over control of a planet brings the Enterprise to a space station, where they must deal with Klingons, edgy Federation officials, and a previously-unknown species of small, unbearably cute, voraciously hungry, and rapidly-multiplying furry creatures.
WikiBread and Circuses
2x14
Kirk, Spock, and McCoy are captured on a planet that resembles a Roman Empire with 20th century technology. They are set to die at the hands of gladiators for the sake of public spectacle.
WikiJourney to Babel
2x15
As the Enterprise comes under attack on the way to a diplomatic conference on Babel, one of the alien dignitaries is murdered, and Spock's estranged father Sarek is the prime suspect – but he is also deathly ill, and only Spock can save him.
WikiA Private Little War
2x16
On a planet with a primitive civilization, the Enterprise discovers that the Klingons are providing a Stone Age society with increasingly-advanced weaponry.
WikiThe Gamesters of Triskelion
2x17
Kirk, Uhura, and Chekov are kidnapped by aliens and forced to fight other aliens so that a mentally superior race can gamble on the winner.
WikiObsession
2x18
A survey of Argus X brings the Enterprise crew in confrontation with a vampiric cloud that killed a crew Kirk was on years ago, captained by the father of an ensign currently assigned to the ship.
WikiThe Immunity Syndrome
2x19
After Spock senses the destruction of the Vulcan-manned starship Intrepid, the Enterprise encounters an enormous single-celled organism that feeds on energy which threatens the galaxy as it prepares to reproduce.
WikiA Piece of the Action
2x20
Returning to a planet last visited by an Earth ship 100 years earlier, the Enterprise finds a planet that has based its culture on the Chicago gangsters of the 1920s.
WikiBy Any Other Name
2x21
Extragalactic aliens hijack the Enterprise and turn the crew into inert solids, leaving the four senior officers on their own to exploit their captors' weaknesses.
WikiReturn to Tomorrow
2x22
Three survivors from a race that died half a million years ago "borrow" the bodies of Enterprise crew members so they can build android bodies for themselves.
WikiPatterns of Force
2x23
The Enterprise, searching for a missing Federation historian, discovers that the historian has apparently contaminated the cultural development of the planet where he was assigned as a cultural observer to have it follow the societal path of Nazi Germany in the 1930s and '40s.
WikiThe Ultimate Computer
2x24
The Enterprise tests a computer that, if successful, could replace Kirk as the captain.
WikiThe Omega Glory
2x25
The Enterprise discovers the derelict starship Exeter drifting in space, its entire crew killed by an unknown plague and her captain missing.
WikiAssignment: Earth
2x26
The Enterprise travels back in time to 1968, where the crew encounters the mysterious Gary Seven who claims to be sent by advanced beings trying to help Earth. (Season finale)
WikiSeason 3
Spectre of the Gun
3x01
Captain Kirk, Mr. Spock, Dr. McCoy, Scotty, and Chekov are forced to re-enact the gunfight at the O.K. Corral in Tombstone as the team that lost the gunfight.
WikiElaan of Troyius
3x02
The Enterprise transports Elaan, Dohlman of Elas, to an arranged marriage on Troyius.
WikiThe Paradise Syndrome
3x03
Kirk loses his memory and joins the descendants of a tribe of Native Americans.
WikiThe Enterprise Incident
3x04
Acting apparently restless and irrational, Captain Kirk inexplicably orders the Enterprise into Romulan space where the ship is quickly captured by the enemy and Kirk held captive aboard their flagship.
WikiAnd the Children Shall Lead
3x05
A group of children on the Federation outpost Triacus, under the influence of an evil spirit, commandeer the Enterprise.
WikiSpock's Brain
3x06
An alien raids the Enterprise and steals Spock's brain, leading Kirk and McCoy into a desperate race to retrieve it. (Season Premiere)
WikiIs There in Truth No Beauty?
3x07
A beautiful woman escorts an alien ambassador so hideously ugly that the sight of him can drive a Human insane.
WikiThe Empath
3x08
On a doomed planet Kirk, Spock and McCoy become the subjects of an alien experiment whose mysterious intention involves a beautiful, empathic woman.
WikiThe Tholian Web
3x09
While trying to rescue the Starfleet ship USS Defiant, Captain Kirk disappears when the dead ship is pulled into interspace. The Enterprise is then attacked by a mysterious local race, the Tholians.
WikiFor the World is Hollow and I Have Touched the Sky
3x10
The Enterprise finds an asteroid that contains a generational ship on a collision course with an inhabited planet.
WikiDay of the Dove
3x11
An extremely powerful non-corporeal being brings the Enterprise and a Klingon ship in direct conflict with one another.
WikiPlato's Stepchildren
3x12
The Enterprise finds a planet inhabited by aliens who were once followers of the Greek philosopher Plato.
WikiWink of an Eye
3x13
The Enterprise is hijacked by hyperaccelerated, sterile aliens who want the crew for breeding stock.
WikiThat Which Survives
3x14
Enterprise crew members are stranded on a ghost planet and terrorized by the image of a beautiful woman.
WikiLet That Be Your Last Battlefield
3x15
The crew of the Enterprise find themselves caught in the middle of an intractable conflict with a bizarre fugitive alien and his equally belligerent pursuer.
WikiWhom Gods Destroy
3x16
Kirk and Spock are held captive in an insane asylum by a former Starfleet hero.
WikiThe Mark of Gideon
3x17
Kirk is held captive on an empty duplicate of the USS Enterprise.
WikiThe Lights of Zetar
3x18
At planetoid Memory Alpha, an Enterprise crew member's body is taken over by mysterious energy lifeforms.
WikiThe Cloud Minders
3x19
Kirk's efforts to obtain a vital mineral are complicated by terrorists striking at the beautiful cloud city Stratos and its virulent apartheid policies.
WikiThe Way to Eden
3x20
The Enterprise picks up a group of renegades who have rejected modern technological life to search for the mythical planet Eden.
WikiRequiem for Methuselah
3x21
While the Enterprise searches for the rare cure to a deadly disease, the landing party is confronted by a reclusive man who is willing to kill to preserve his privacy.
WikiThe Savage Curtain
3x22
Kirk and Spock are forced to fight alongside such historical figures as Abraham Lincoln of Earth and Surak of Vulcan by rock-like aliens who want to understand the concepts of "good" and "evil."
WikiAll Our Yesterdays
3x23
Kirk, Spock, and McCoy are trapped in a planet's distant pasts, where Spock finds love with an exiled woman.
WikiTurnabout Intruder
3x24
A mad scientist tries to take control of the Enterprise by switching bodies with Captain Kirk. (Series finale)
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