I see that there was a re-watch back in 2017, but I've started one up and I'm trying to stick to one episode per day, if possible. This is the 1st season list I'm using:
x The Cage (unaired pilot) x Where No Man Has Gone Before x The Corbomite Maneuver x Mudd's Women The Enemy Within The Man Trap The Naked Time Charlie X Balance of Terror What Are Little Girls Made Of? Dagger of the Mind Miri The Conscience of the King The Galileo Seven Court Martial The Menagerie (Parts I and II) Shore Leave The Squire of Gothos Arena The Alternative Factor Tomorrow is Yesterday The Return of the Archons A Taste of Armageddon Space Seed This Side of Paradise The Devil in the Dark Errand of Mercy City on the Edge of Forever Operation: Annihilate!
I skipped The Cage -- I'll just watch The Menagerie. Tonight's episode is The Enemy Within.