Season 1

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  6.6/101,220 votes

  Beyond the Farthest Star

  Season 1 Episode 1 - Aired 9/8/1973

  Stardate: 5521.3 In orbit around a dead star, the Enterprise comes across a huge starship inhabited by a parasitic life form that threatens the entire ship.

  Director: Unknown

  Writer: Samuel A. Peeples

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  8.0/101,264 votes

  Yesteryear

  Season 1 Episode 2 - Aired 9/15/1973

  Stardate: 5373.4 Spock travels back in time to prevent his death as a young Vulcan.

  Director: Unknown

  Writer: D.C. Fontana

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  6.7/101,010 votes

  One of Our Planets Is Missing

  Season 1 Episode 3 - Aired 9/22/1973

  Stardate: 5371.3 The crew of the Enterprise races to find a way to stop a cloud from destroying inhabited planets.

  Director: Unknown

  Writer: Marc Daniels

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  6.5/101,008 votes

  The Lorelei Signal

  Season 1 Episode 4 - Aired 9/29/1973

  Stardate: 5483.7 Female crew members must take over the Enterprise when the men are incapacitated by a race of sirens.

  Director: Unknown

  Writer: Margaret Armen

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  7.0/101,033 votes

  More Tribbles, More Troubles

  Season 1 Episode 5 - Aired 10/6/1973

  Stardate: 5392.4 Cyrano Jones introduces tribbles that cannot reproduce.

  Director: Unknown

  Writer: David Gerrold

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  6.8/10925 votes

  The Survivor

  Season 1 Episode 6 - Aired 10/13/1973

  Stardate: 5143.3 The Enterprise finds a long-lost explorer.

  Director: Unknown

  Writer: James Schmerer

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  6.1/10906 votes

  The Infinite Vulcan

  Season 1 Episode 7 - Aired 10/20/1973

  Stardate: 5554.4 A race of plant people, and their master, have a plan to force peace onto the galaxy.

  Director: Unknown

  Writer: Walter Koenig

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  5.9/10912 votes

  The Magicks of Megas-tu

  Season 1 Episode 8 - Aired 10/27/1973

  Stardate: 1254.4 At the center of the galaxy, the Enterprise discovers a race of powerful aliens.

  Director: Unknown

  Writer: Larry Brody

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  6.2/10850 votes

  Once Upon a Planet

  Season 1 Episode 9 - Aired 11/3/1973

  Stardate: 5591.2 Kirk returns to the "shore leave" planet, but it's not as peaceful as it was when they last saw it.

  Director: Unknown

  Writer: Chuck Menville

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  6.3/10856 votes

  Mudd's Passion

  Season 1 Episode 10 - Aired 11/10/1973

  Stardate: 4978.5 Space con artist Harry Mudd returns, selling a fake love potion.

  Director: Unknown

  Writer: Stephen Kandel

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  6.6/10829 votes

  The Terratin Incident

  Season 1 Episode 11 - Aired 11/17/1973

  Stardate: 5577.3 The Enterprise crew begins to shrink after radiation exposure.

  Director: Unknown

  Writer: Paul Schneider

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  6.9/10840 votes

  The Time Trap

  Season 1 Episode 12 - Aired 11/24/1973

  Stardate: 5267.6 The Enterprise crew must work with Klingons to escape from a pocket universe.

  Director: Unknown

  Writer: Joyce Perry

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  6.4/10809 votes

  The Ambergris Element

  Season 1 Episode 13 - Aired 12/1/1973

  Stardate: 5499.9 While exploring the planet Argo, Kirk and Spock are turned into water breathers.

  Director: Unknown

  Writer: Margaret Armen

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  7.0/10874 votes

  The Slaver Weapon

  Season 1 Episode 14 - Aired 12/15/1973

  Stardate: 4187.3 Spock, Sulu, and Uhura discover a time capsule from an ancient and technologically advanced race. However, it draws some unwanted attention.

  Director: Unknown

  Writer: Larry Niven

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  6.7/10797 votes

  The Eye of the Beholder

  Season 1 Episode 15 - Aired 1/5/1974

  Stardate: 5501.2 Telepathic aliens put Kirk, Spock and McCoy in a zoo.

  Director: Unknown

  Writer: David P. Harmon

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  6.2/10805 votes

  The Jihad

  Season 1 Episode 16 - Aired 1/12/1974

  Stardate: 5683.1 Kirk and Spock are recruited for a heist to recover a stolen relic, which if not recovered could spark an galactic jihad.

  Director: Unknown

  Writer: Stephen Kandel