Any worst list that doesn't include
Spock's Brain
can't be taken seriously. In my humble but honest opinion, it's the worst episode of the entire series by far.
There are 8.2 billion people in the world. 8.19 billion of them have never heard of and don't give a fuck about Charlie Kirk. Get over it.

My password is password.

Best:
City on the Edge of Forever
The Menagerie
The Doomsday Machine
The Corbomite Maneuver
Amok Time
The Trouble with Tribbles
Balance of Terror
Worst:
Spock's Brain
And the Children Shall Lead
The Lights of Zetar
The Way to Eden
A Private Little War
The Alternative Factor
The Apple

Bump.
“Call a SPADE, a SPADE; and a TRANNY, a TRANNY, or an IT!!!”.
"THAT'S SOME BAD
SHIT
,
HARRY
!".

Best-
Arena
Mirror, Mirror
Space Seed
Where No Man Has Gone Before
The Corbomite Maneuver
The City on the Edge of Forever
Balance of Terror
Worst-
Spock's Brain
The Savage Curtain
Catspaw
Wolf in the Fold
Mudd's Women
The Way to Eden
And the Children Shall Lead

By no means absolute but for now:
Best:
1.
The City on the Edge of Forever
2.
The Corbomite Maneuver
3.
Space Seed
4.
Journey to Babel
5.
The Doomsday Machine
6.
The Man Trap
7.
The Conscience of the King
Worst
7.
Return to Tomorrow
6.
The Galileo Seven
5.
And The Children Shall Lead
4.
Spocks Brain
3.
The Paradise Syndrome
2.
The Alternative Factor
1.
The Apple
My DVD Collection:
http://www.imdb.com/list/ls063878029/

Best-
Arena
Mirror, Mirror
Space Seed
Where No Man Has Gone Before
The Corbomite Maneuver
The City on the Edge of Forever
Balance of Terror
Worst-
Spock's Brain
The Savage Curtain
Catspaw
Wolf in the Fold
The Way to Eden
Mudd's Women
The Alternative Factor

We all have different opinions, of course. "Whom Gods Destroy" is salvaged by a fine performance by Steve Ihnat; I like "Spock's Brain" as a satire on on network television, and in the "so bad it's good" vein of entertainment. "Plato's Stepchildren" is pretty awful.
"Catspaw" has a fairly interesting theme - the psychological horror of things that go bump in the night - but the theme is poorly explored, it has limited, repetitive action, and the atmosphere is wasted on a fairly silly narrative. I think they could have done much, much better. As a "harmless piece of fluff" it should at least be more entertaining.

This message has been deleted.

And I care about the inane ramblings of the president of the Dunning-Kruger Club why, exactly…?
Go **** yourself, moron.
There are 8.2 billion people in the world. 8.19 billion of them have never heard of and don't give a fuck about Charlie Kirk. Get over it.

ur a retard
My password is password.

I wonder why so many have
Mirror, Mirror
on their best lists. I wouldn't put it on my worst list, but "alternate universe" stories just don't do much for me.
But anyway, and in no particular order…
Worst:

1. Spock's Brain
2. The Omega Glory
3. Bread and Circuses
4. Patterns of Force
5. The Squire of Gothos
6. The Apple
7. The Way to Eden
   Best:
8. Amok Time
9. The City on the Edge of Forever
10. Journey to Babel
11. The Conscience of the King
12. Balance of Terror
13. Where No Man Has Gone Before
14. The Enterprise Incident
    It was a lot harder to fill the "best" list than it was the "worst." I loved the show when I was a kid, but it's terribly dated now.
    There are 8.2 billion people in the world. 8.19 billion of them have never heard of and don't give a fuck about Charlie Kirk. Get over it.

"Aliens with gnarly mental powers" is one of the most overused (and annoying) tropes in all of science fiction.
There are 8.2 billion people in the world. 8.19 billion of them have never heard of and don't give a fuck about Charlie Kirk. Get over it.

The only positive for me about the episode is seeing Barbara Babcock again. IMO, she deserved more screen time and would have been far better in a more "command" type role like in "Wink Of An Eye" than Kathie Browne (who IMO lacked Babcock's gravitas to be credible as a queen).

The "power corrupts" theme of "Plato's Stepchildren" has been done better, and so has the "aliens with gnarly mental powers" bit. The centerpiece of the episode is an extended torture/humiliation scene, which is particularly distasteful and unpleasant, and that is what leaves a bad taste for me. There is nothing enjoyable, entertaining, or interesting in these scenes, and no real point being made. It is uncomfortable and frankly painful to watch.
The only positive thing about the episode is the always excellent Michael Dunn.

I'm curious why so many people have plato's stepchildren on their worst episode list, and why it has such a low rating on imdb? Surely it isn't because of that interracial kiss considering it's 2016. I didn't think the episode was one of the best, but it wasn't so horrible to call it one of the worst either. Reasons?

No accounting for taste, I guess. One man's meat is another man's poison, lol.

Best:

1. Doomsday Machine
2. Balance of Terror
3. Mirror Mirror
4. City on Edge of Forever
5. Galileo 7
6. Devil in the Dark
7. Enterprise Incident
   Corbomite Maneuver, Arena and Shore Leave just miss
   Worst:
8. Empath
9. And the Children Shall Lead
10. The Way to Eden
11. That Which Survives
12. Mark of Gideon
13. I Mudd
14. Mudds Women
    Hated the character of Mudd which is why both episodes are listed. Mark of Gideon, Let That be Your Last Battlefield and Alternative Factor next in line.

Not definitive for me by any means, but-
Best:
Balance of Terror
Space Seed
City on the Edge of Forever
Mirror Mirror
The Doomsday Machine
Journey to Babel
The Tholian Web
The Trouble with Tribbles, A Piece of the Action, The Ultimate Computer, The Naked Time, A Taste of Armageddon, and more could have easily been included. The Tholian Web is there in part as a s3 representative.
Worst:
The Alternative Factor
Who Mourns for Adonais?
The Paradise Syndrome
And the Children Shall Lead
Wink of an Eye
The Mark of Gideon
The Way to Eden
Omega Glory and Spock's Brain probably deserve to be on the worst list before a couple of others listed here, but I get more entertainment value out of them (same goes for The Way to Eden, but its bad enough to make the list anyway).

Best:

1. The Corbomite Maneuver
2. Balance of Terror
3. City on the Edge of Forever
4. The Naked Time
5. The Trouble with Tribbles
6. Mirror, Mirror
7. A Taste of Armageddon
   Bubbling under: The Immunity Syndrome
   Worst:
8. And the Children shall Lead
9. Plato's Stepchildren
10. The Alternative Factor
11. The Mark of Gideon
12. The Lights of Zetar
13. The Empath
14. Catspaw
    Bubbling under: The Omega Glory

"
Day of the Dove
" is the second-best episode of the third-season after "
The Enterprise Incident
".
I'll let you know when I come-up with a new signature,
.

Best
=The Doomsday Machine
=All Our Yesterdays
=Balance Of Terror
=Mirror, Mirror
=Trouble With Tribbles
=The Tholian Web
=The Ultimate Computer
Worst
=Patterns Of Force
=And The Children Shall Lead
=Metamorphosis
=The Alternative Factor
=Requiem For Methuselah (Kirk at his unprofessional worst)
=Let That Be Your Last Battlefield (sledgehammer sermonizing)
=Day Of The Dove (ditto, ditto)

Best:
Balance of Terror
The Doomsday Machine
The Corbomite Maneuver
City on the Edge of Forever
Mirror, Mirror
Journey to Babel
A Taste of Armageddon
Worst:
And the Children Shall Lead
Plato's Stepchildren
The Way to Eden
The Alternative Factor
The Lights of Zetar
The Mark of Gideon
The Apple
Over 20,001 Tacos ReturnedAS GARBAGE!

I happen to like those episodes. The fact that you have a problem with my personal likes is irrelevant.