3 - 1Spock's Brain Sep. 20, 1968
3 - 2The Enterprise Incident Sep. 27, 1968
3 - 3The Paradise Syndrome Oct. 04, 1968
3 - 4And the Children Shall Lead Oct. 11, 1968
3 - 5Is There in Truth No Beauty? Oct. 18, 1968
3 - 6Spectre of the Gun Oct. 25, 1968
3 - 7Day of the Dove Nov. 01, 1968
3 - 8For the World Is Hollow and I Have Touched the Sky Nov. 08, 1968
3 - 9The Tholian Web Nov. 15, 1968
3 - 10Plato's Stepchildren Nov. 22, 1968
3 - 11Wink of an Eye Nov. 29, 1968
3 - 12The Empath Dec. 06, 1968
3 - 13Elaan of Troyius Dec. 20, 1968
3 - 14Whom Gods Destroy Jan. 03, 1969
3 - 15Let That Be Your Last Battlefield Jan. 10, 1969
3 - 16The Mark of Gideon Jan. 17, 1969
3 - 17That Which Survives Jan. 24, 1969
3 - 18The Lights of Zetar Jan. 31, 1969
3 - 19Requiem for Methuselah Feb. 14, 1969
3 - 20The Way to Eden Feb. 21, 1969
3 - 21The Cloud Minders Feb. 28, 1969
3 - 22The Savage Curtain Mar. 07, 1969
3 - 23All Our Yesterdays Mar. 14, 1969
3 - 24Turnabout Intruder Jun. 03, 1969