Seasons & episodes
S2 · E6The Doomsday Machine 1967-10-20 · 51 min
The starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.
S2 · E7Catspaw 1967-10-27 · 50 min
Two powerful aliens threaten the well-being of the Enterprise and her crew.
S2 · E8I, Mudd 1967-11-03 · 51 min
Captain Kirk has a second run-in with the conman, Harry Mudd. Mudd is now the supreme ruler of a planet of androids who cater to his every whim.
S2 · E9Metamorphosis 1967-11-10 · 50 min
A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.
S2 · E10Journey to Babel 1967-11-17 · 50 min
The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.
S2 · E11Friday's Child 1967-12-01 · 50 min
The crew of the Enterprise become entangled in a planet's tribal power struggle.
S2 · E12The Deadly Years 1967-12-08 · 50 min
Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
S2 · E13Obsession 1967-12-15 · 50 min
Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.
S2 · E14Wolf in the Fold 1967-12-22 · 51 min
A series of bizarre murders points to Mr. Scott as the prime suspect.
S2 · E15The Trouble With Tribbles 1967-12-29 · 50 min
The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.
S2 · E16The Gamesters of Triskelion 1968-01-05 · 50 min
Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.
S2 · E17A Piece of the Action 1968-01-12 · 50 min
The Enterprise visits a planet with an Earth-like 1920s gangster culture.
S2 · E18The Immunity Syndrome 1968-01-19 · 50 min
The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.
S2 · E19A Private Little War 1968-02-02 · 51 min
The crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and is forced to help maintain a balance of power.
S2 · E20Return to Tomorrow 1968-02-09 · 50 min
Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.
S2 · E21Patterns of Force 1968-02-16 · 50 min
The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.
S2 · E22By Any Other Name 1968-02-23 · 50 min
Beings from another galaxy commandeer the Enterprise in an attempt to return home.
S2 · E23The Omega Glory 1968-03-01 · 50 min
Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.
S2 · E24The Ultimate Computer 1968-03-08 · 50 min
A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.
S2 · E25Bread and Circuses 1968-03-15 · 50 min
The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.
S2 · E26Assignment: Earth 1968-03-29 · 50 min
While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.
S3 · E1Spock's Brain 1968-09-20 · 51 min
An alien female beams aboard the ship and, after incapacitating the rest of the crew, surgically removes Spock's brain. Kirk and the crew have just hours to locate and replace it before Spock's body dies.
S3 · E2The Enterprise Incident 1968-09-27 · 51 min
The crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.
S3 · E3The Paradise Syndrome 1968-10-04 · 51 min
An alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.