This is just a selection of ten episodes. I could list another ten and they'd be just as essential viewing. This is one of my favourite T.V. series of all time.
▪ "The Cage"--I say "The Cage" because "The Menagerie" was two episodes and I don't want to waste two spots for just one story--and anyway, I'm all about the Susan Oliver and she was all in "The Cage"
▪ "What Are Little Girls Made Of?"--Shirley Jackson hummina hummina hummina
▪ "Miri"--I like me a good Yeoman Rand story
▪ "The Squire of Gothos"--ah, Trelane
▪ "The City on the Edge of Forever"--obviously
▪ "Mirror Mirror"--the worst timeline
▪ "A Piece of the Action"--it's a royal fizzbin
▪ "Assignment Earth"--for Teri Garr
▪ "The Paradise Syndrome"--this one always makes me sad for Kirk
▪ "Wink of an Eye"--you've got Kathie Browne, a mystery for Spock to solve and a science fiction premise worthy of the Flash--what's not to like?