This was the last season of The Original Series. There were a total of 79 episodes made before the show was canceled. I doubt anyone at the time could have predicted that this would lead to one of the all time biggest and best franchises in TV (and movie) history.

Spock’s Brain (September 20, 1968)

The Enterprise Incident (September 27, 1968)

The Paradise Syndrome (October 4, 1968)

And the Children Shall Lead (October 11, 1968)

Is There in Truth No Beauty (October 18, 1967)

Spectre of the Gun (October 25, 1968)

Day of the Dove (November 1, 1968)

For the World Is Hollow and I Have Touched the Sky (November 8, 1968)

The Tholian Web (November 15, 1968)

Plato’s Stepchildren (November 22, 1968)

Wink of an Eye (November 29, 1968)

The Empath (December 6, 1968)

Elaan of Troyius (December 20, 1968)

Whom God’s Destroy (January 3, 1969)

Let That Be Your Last Battlefield (January 10, 1969)

The Mark of Gideon (January 17, 1969)

That Which Survives (January 24, 1969)

The Lights of Zetar (January 31, 1969)

Requiem for Methuselah (February 14, 1969)

The Way to Eden (February 21, 1969)

The Cloud Minders (February 28, 1969)

The Savage Curtain (March 7, 1969)

All Our Yesterdays (March 14, 1969)

Turnabout Intruder (June 3, 1969)