3x21 The Die Is Cast (2)

Deep Space 9

This includes Star Trek: TOS, Star Trek: The Animated Series, Star Trek: TNG, Star Trek: DS9, Star Trek: Voyager, and Star Trek: Enterprise.

This lists the essential episodes recommended by Max Temkin as part of his Medium post:
https://medium.com/maxistentialism-blog/star-trek-deep-space-nine-in-82-5-hours-10acde591fd2