第 1 季 共 29 集
播出时间：1966年9月9日
第 1 集 The Man Trap
播出时间：1966年9月9日
Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.
第 2 集 Charlie X
播出时间：1966年9月16日
Captain Kirk must learn the limits to the power of a 17-year-old boy with the psychic ability to create anything and destroy anyone.
第 3 集 Where No Man Has Gone Before
播出时间：1966年9月23日
While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives two crewmen godlike powers.
第 4 集 The Naked Time
播出时间：1966年9月30日
A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.
第 5 集 The Enemy Within
播出时间：1966年10月7日
A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if they don't merge the two back together.
第 6 集 Mudd's Women
播出时间：1966年10月14日
The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.
第 7 集 What Are Little Girls Made Of?
播出时间：1966年10月21日
Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.
第 8 集 Miri
播出时间：1966年10月28日
Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.
第 9 集 Dagger of the Mind
播出时间：1966年11月4日
Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.
第 10 集 The Corbomite Maneuver
播出时间：1966年11月11日
The Enterprise encounters a vast alien ship that sets out to test them.
第 11 集 The Menagerie (1)
播出时间：1966年11月18日
Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.
第 12 集 The Menagerie (2)
播出时间：1966年11月25日
Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.
第 13 集 The Conscience of the King
播出时间：1966年12月9日
Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.
第 14 集 Balance of Terror
播出时间：1966年12月16日
Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.
第 15 集 Shore Leave
播出时间：1966年12月30日
The Enterprise crew take shore leave on a peaceful, pastoral planet...where their dreams and fantasies come to life.
第 16 集 The Galileo Seven
播出时间：1967年1月6日
Spock commands a stranded away team when their shuttlecraft is stranded on a planet with hostile natives.
第 17 集 The Squire of Gothos
播出时间：1967年1月13日
The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself a 18th century Englishman.
第 18 集 Arena
播出时间：1967年1月20日
When a mysterious alien race destroy an Earth colony, the Enterprise pursues but Kirk and the alien captain are forced to fight each other by powerful aliens.
第 19 集 Tomorrow Is Yesterday
播出时间：1967年1月27日
The Enterprise collides with a black hole and is thrown back to Earth in the 20th century, where they must find a way back and erase any trace of their presence. Matters become complicated when they rescue an Air Force pilot and cannot return him without changing history...but if he disappears that will change history as well.
第 20 集 Court Martial
播出时间：1967年2月3日
Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.
第 21 集 The Return of the Archons
播出时间：1967年2月10日
The Enterprise encounters a seemingly peaceful civilization run by a ""benevolent"" being named Landru...who intends for them to join his people.
第 22 集 Space Seed
播出时间：1967年2月17日
The Enterprise picks up a crew of genetic supermen from the 20th century...and their leader, Khan, plans to create a new empire.
第 23 集 A Taste of Armageddon
播出时间：1967年2月24日
The Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.
第 24 集 This Side of Paradise
播出时间：1967年3月3日
The Enterprise crew is trapped in paradise when they come to rescue colonists who have fallen to pacifying alien spores and become infected themselves.
第 25 集 The Devil in the Dark
播出时间：1967年3月10日
Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.
第 26 集 Errand of Mercy
播出时间：1967年3月24日
The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates a humble planet caught in the middle - Organia, inhabited by pacifists
第 27 集 The Alternative Factor
播出时间：1967年3月31日
Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
第 28 集 The City on the Edge of Forever
播出时间：1967年4月7日
Kirk and Spock must travel into the past in order to correct a change that will alter history.
第 29 集 Operation: Annihilate!
播出时间：1967年4月14日
Kirk and the Enterprise must combat parasitic aliens.
