Star Trek: The Original Series — Episode Guide — BoldlyTrek
BoldlyTrek — Episode Guides / The Original Series
Prime Timeline — 23rd Century

Star Trek: The Original Series

Run1966 – 1969
Seasons3
Episodes79 + unaired pilot
NetworkNBC
In-Universe Settingc. 2266 – 2269

Kirk’s five-year mission. Where it all started. Seventy-nine episodes that established the Federation, the Prime Directive, Klingons, Vulcans, and the moral argument at the heart of everything that followed.

Review scores and links will be added as episodes are covered on BoldlyTrek. All scores are out of 10.
TOS The Cage
Unaired Pilot 1 episode — 1965
Pilot
The Cage Unaired 1965 / Released 1988
1965 / 1988 8/10 My review is here
TOS S1
Season One 29 episodes — 1966–1967
S01E01
The Man Trap
8 Sep 19667/10My review is here
S01E02
Charlie X
15 Sep 19668/10My review is here
S01E03
Where No Man Has Gone Before
22 Sep 19668/10My review is here
S01E04
The Naked Time
29 Sep 19668/10My review is here
S01E05
The Enemy Within
6 Oct 19666/10My review is here
S01E06
Mudd’s Women
13 Oct 19667/10My review is here
S01E07
What Are Little Girls Made Of?
20 Oct 19667/10My review is here
S01E08
Miri
27 Oct 19667/10My review is here
S01E09
Dagger of the Mind
3 Nov 19667/10My review is here
S01E10
The Corbomite Maneuver
10 Nov 19669/10My review is here
S01E11
The Menagerie, Part I
17 Nov 19668/10My review is here
S01E12
The Menagerie, Part II
24 Nov 19668/10My review is here
S01E13
The Conscience of the King
8 Dec 1966-/10Not yet reviewed
S01E14
Balance of Terror
15 Dec 1966-/10Not yet reviewed
S01E15
Shore Leave
29 Dec 1966-/10Not yet reviewed
S01E16
The Galileo Seven
5 Jan 1967-/10Not yet reviewed
S01E17
The Squire of Gothos
12 Jan 1967-/10Not yet reviewed
S01E18
Arena
19 Jan 1967-/10Not yet reviewed
S01E19
Tomorrow Is Yesterday
26 Jan 1967-/10Not yet reviewed
S01E20
Court Martial
2 Feb 1967-/10Not yet reviewed
S01E21
The Return of the Archons
9 Feb 1967-/10Not yet reviewed
S01E22
Space Seed
16 Feb 1967-/10Not yet reviewed
S01E23
A Taste of Armageddon
23 Feb 1967-/10Not yet reviewed
S01E24
This Side of Paradise
2 Mar 1967-/10Not yet reviewed
S01E25
The Devil in the Dark
9 Mar 1967-/10Not yet reviewed
S01E26
Errand of Mercy
23 Mar 1967-/10Not yet reviewed
S01E27
The Alternative Factor
30 Mar 1967-/10Not yet reviewed
S01E28
The City on the Edge of Forever
6 Apr 1967-/10Not yet reviewed
S01E29
Operation — Annihilate!
13 Apr 1967-/10Not yet reviewed
TOS S2
Season Two 26 episodes — 1967–1968
S02E01
Amok Time
15 Sep 1967-/10Not yet reviewed
S02E02
Who Mourns for Adonais?
22 Sep 1967-/10Not yet reviewed
S02E03
The Changeling
29 Sep 1967-/10Not yet reviewed
S02E04
Mirror, Mirror
6 Oct 1967-/10Not yet reviewed
S02E05
The Apple
13 Oct 1967-/10Not yet reviewed
S02E06
The Doomsday Machine
20 Oct 1967-/10Not yet reviewed
S02E07
Catspaw
27 Oct 1967-/10Not yet reviewed
S02E08
I, Mudd
3 Nov 1967-/10Not yet reviewed
S02E09
Metamorphosis
10 Nov 1967-/10Not yet reviewed
S02E10
Journey to Babel
17 Nov 1967-/10Not yet reviewed
S02E11
Friday’s Child
1 Dec 1967-/10Not yet reviewed
S02E12
The Deadly Years
8 Dec 1967-/10Not yet reviewed
S02E13
Obsession
15 Dec 1967-/10Not yet reviewed
S02E14
Wolf in the Fold
22 Dec 1967-/10Not yet reviewed
S02E15
The Trouble with Tribbles
29 Dec 1967-/10Not yet reviewed
S02E16
The Gamesters of Triskelion
5 Jan 1968-/10Not yet reviewed
S02E17
A Piece of the Action
12 Jan 1968-/10Not yet reviewed
S02E18
The Immunity Syndrome
19 Jan 1968-/10Not yet reviewed
S02E19
A Private Little War
2 Feb 1968-/10Not yet reviewed
S02E20
Return to Tomorrow
9 Feb 1968-/10Not yet reviewed
S02E21
Patterns of Force
16 Feb 1968-/10Not yet reviewed
S02E22
By Any Other Name
23 Feb 1968-/10Not yet reviewed
S02E23
The Omega Glory
1 Mar 1968-/10Not yet reviewed
S02E24
The Ultimate Computer
8 Mar 1968-/10Not yet reviewed
S02E25
Bread and Circuses
15 Mar 1968-/10Not yet reviewed
S02E26
Assignment: Earth
29 Mar 1968-/10Not yet reviewed
TOS S3
Season Three 24 episodes — 1968–1969
S03E01
Spock’s Brain
20 Sep 1968-/10Not yet reviewed
S03E02
The Enterprise Incident
27 Sep 1968-/10Not yet reviewed
S03E03
The Paradise Syndrome
4 Oct 1968-/10Not yet reviewed
S03E04
And the Children Shall Lead
11 Oct 1968-/10Not yet reviewed
S03E05
Is There in Truth No Beauty?
18 Oct 1968-/10Not yet reviewed
S03E06
Spectre of the Gun
25 Oct 1968-/10Not yet reviewed
S03E07
Day of the Dove
1 Nov 1968-/10Not yet reviewed
S03E08
For the World Is Hollow and I Have Touched the Sky
8 Nov 1968-/10Not yet reviewed
S03E09
The Tholian Web
15 Nov 1968-/10Not yet reviewed
S03E10
Plato’s Stepchildren
22 Nov 1968-/10Not yet reviewed
S03E11
Wink of an Eye
29 Nov 1968-/10Not yet reviewed
S03E12
The Empath
6 Dec 1968-/10Not yet reviewed
S03E13
Elaan of Troyius
20 Dec 1968-/10Not yet reviewed
S03E14
Whom Gods Destroy
3 Jan 1969-/10Not yet reviewed
S03E15
Let That Be Your Last Battlefield
10 Jan 1969-/10Not yet reviewed
S03E16
The Mark of Gideon
17 Jan 1969-/10Not yet reviewed
S03E17
That Which Survives
24 Jan 1969-/10Not yet reviewed
S03E18
The Lights of Zetar
31 Jan 1969-/10Not yet reviewed
S03E19
Requiem for Methuselah
14 Feb 1969-/10Not yet reviewed
S03E20
The Way to Eden
21 Feb 1969-/10Not yet reviewed
S03E21
The Cloud Minders
28 Feb 1969-/10Not yet reviewed
S03E22
The Savage Curtain
7 Mar 1969-/10Not yet reviewed
S03E23
All Our Yesterdays
14 Mar 1969-/10Not yet reviewed
S03E24
Turnabout Intruder
3 Jun 1969-/10Not yet reviewed
Episode count: 79 broadcast episodes plus the unaired pilot. Airdates reflect original NBC broadcast dates. The Cage was officially released in 1988 as part of the TOS Blu-ray set having previously circulated in edited form as part of The Menagerie. All scores and review links will be updated as coverage is published on BoldlyTrek.