Definitely “The City on the Edge of Forever (1967)” hands down.
Probably the finest hour-long sci fi story ever.
Yup!
I loved this scene:
[Room]
(It must be some days later, because Spock has already built a 50's horror movie contraption, complete with static electricity running between two vertical wires. Kirk enters with groceries and turns the whining thing off.)
SPOCK: Captain, I must have some platinum. A small block would be sufficient, five or six pounds. By passing certain circuits through there to be used as a duodynetic field core...
KIRK: Mister Spock, I've brought you some assorted vegetables, baloney in a hard roll for myself, and I've spent the other nine tenths of our combined salaries for the last three days on filling this order for you. Mister Spock, this bag does not contain platinum, silver or gold, nor is it likely to in the near future.
SPOCK: Captain, you're asking me to work with equipment which hardly very far ahead of stone knives and bearskins.
KIRK: McCoy'll be along in a few days, perhaps sooner. There's no guarantee that these currents in time will bring us together. This has to work.
SPOCK: Captain. Captain, in three weeks at this rate, possibly a month, I might reach the first mnemonic memory circuits.
(There's a knock at the door.)
KIRK: Your hat.
EDITH: If you can leave immediately, I can get you five hours work at twenty two cents an hour. What? What on Earth is that?
SPOCK: I am endeavouring, ma'am, to construct a mnemonic memory circuit using stone knives and bearskins.
I like “A Taste of Armageddon” when Scotty is left in command of the Enterprise and goes full badass.
I agree. City on edge of tomorrow.
Agreed
✅