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Star Trek: The Original Series (season 1)
No. of episodes
29
Next season

The first season of Star Trek: The Original Series aired from 1966 to 1967.

Star Trek
The Original Series
Season 1
1966–1967

The Man TrapCharlie XWhere No Man Has Gone BeforeThe Naked TimeThe Enemy WithinMudd's WomenWhat Are Little Girls Made Of?MiriDagger of the MindThe Corbomite Maneuver
The Menagerie, Part IThe Menagerie, Part IIThe Conscience of the KingBalance of TerrorShore LeaveThe Galileo SevenThe Squire of GothosArenaTomorrow Is YesterdayCourt Martial
The Return of the ArchonsSpace SeedA Taste of ArmageddonThis Side of ParadiseThe Devil in the DarkErrand of MercyThe Alternative FactorThe City on the Edge of ForeverOperation: Annihilate!

Season 2
1967–1968

Amok TimeWho Mourns for Adonais?The ChangelingMirror, MirrorThe AppleThe Doomsday MachineCatspawI, MuddMetamorphosisJourney to BabelFriday's ChildThe Deadly YearsObsession
Wolf in the FoldThe Trouble with TribblesThe Gamesters of TriskelionA Piece of the ActionThe Immunity SyndromeA Private Little WarReturn to TomorrowPatterns of ForceBy Any Other Name
The Omega GloryThe Ultimate ComputerBread and CircusesAssignment: Earth

Season 3
1968–1969

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