Underrated: Oh boy, time for some takes...

TOS: This might be the hardest to pick - maybe "The Corbomite Maneuver"? It's fairly well-known, but is crowded out in a season full of classics.

TAS: Pretty much everything besides "Yesteryear" is underrated, but if I have to pick one, I'd pick "The Magicks Of Megas-Tu" for sheer weirdness.

TNG: "Remember Me" - really good episode. I think it's pretty well-regarded, but it should be better regarded.

DS9: I've always been very fond of "The Sound of Her Voice," for some reason. I don't think I'd ever seen anything quite like it when it originally aired.

VOY: I think "Counterpoint" is the finest episode they ever did, but people rarely talk about it.

ENT: Uh...I guess I'll say "Daedalus" - it does a lot of worldbuilding surrounding the transporter, but isn't one of the big "lore" episodes that people tend to talk about.

DSC: "Su'Kal". The cause of the Burn is something that speaks to the humanist core of Star Trek in a way that many people seem to overlook.

PIC: "Remembrance." The first episode of the series is nearly perfect.

LD: I don't know if the nature of the show lends itself to this exercise, but I'll say "An Embarrassment of Dooplers".

PRO: "Crossroads" - the kids arriving at a turning point, and making the kinds of dumb decisions that kids make.

SNW: "Ghosts of Illyria," I guess - this series is still pretty fresh, but this is one of the better episodes that isn't a "gimmick" episode.