S3 E1 - Spock's Brain
S3 E2 - The Enterprise Incident
S3 E3 - The Paradise Syndrome
S3 E4 - And the Children Shall Lead
S3 E5 - Is There in Truth No Beauty?
S3 E6 - Spectre of the Gun
S3 E7 - Day of the Dove
S3 E8 - For the World Is Hollow and I Have Touched the Sky
S3 E9 - The Tholian Web
S3 E10 - Plato's Stepchildren
S3 E11 - Wink of an Eye
S3 E12 - The Empath
S3 E13 - Elaan of Troyius
S3 E14 - Whom Gods Destroy
S3 E15 - Let That Be Your Last Battlefield
S3 E16 - The Mark of Gideon
S3 E17 - That Which Survives
S3 E18 - The Lights of Zetar
S3 E19 - Requiem for Methuselah
S3 E20 - The Way to Eden
The third and final season of the original Star Trek aired Fridays at 10:00-11:00 pm on NBC from September 20, 1968 to March 14, 1969. The final episode aired Tuesday, June 3, 1969 at 7:30-8:30 pm.
Streaming, rent, or buy Star Trek – Season 3:
Currently you are able to watch "Star Trek - Season 3" streaming on Netflix.