Season 3
Artwork
| # | Image | Title | Aired |
|---|---|---|---|
| 1 |  | Spock's Brain | Sep 20, 1968 |
| 2 |  | The Enterprise Incident | Sep 27, 1968 |
| 3 |  | The Paradise Syndrome | Oct 4, 1968 |
| 4 |  | And the Children Shall Lead | Oct 11, 1968 |
| 5 |  | Is There in Truth No Beauty? | Oct 18, 1968 |
| 6 |  | Spectre of the Gun | Oct 25, 1968 |
| 7 |  | Day of the Dove | Nov 1, 1968 |
| 8 |  | For the World is Hollow and I Have Touched the Sky | Nov 8, 1968 |
| 9 |  | The Tholian Web | Nov 15, 1968 |
| 10 |  | Plato's Stepchildren | Nov 22, 1968 |
| 11 |  | Wink of an Eye | Nov 29, 1968 |
| 12 |  | The Empath | Dec 6, 1968 |
| 13 |  | Elaan of Troyius | Dec 20, 1968 |
| 14 |  | Whom Gods Destroy | Jan 3, 1969 |
| 15 |  | Let That Be Your Last Battlefield | Jan 10, 1969 |
| 16 |  | The Mark of Gideon | Jan 17, 1969 |
| 17 |  | That Which Survives | Jan 24, 1969 |
| 18 |  | The Lights of Zetar | Jan 31, 1969 |
| 19 |  | Requiem for Methuselah | Feb 14, 1969 |
| 20 |  | The Way to Eden | Feb 21, 1969 |
| 21 |  | The Cloud Minders | Feb 28, 1969 |
| 22 |  | The Savage Curtain | Mar 7, 1969 |
| 23 |  | All Our Yesterdays | Mar 14, 1969 |
| 24 |  | Turnabout Intruder | Jun 3, 1969 |