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There aren’t to many TV shows from the late 1960’s that still hold entertainment value today but in my humble opinion Star Trek is one of the few. Truly timeless!

Star Trek The Original Series was one of the best classics.

My personal number one will always be Doomsday Machine. Obviously William Windom was phenomenal, but a fantastic story as well, with the last 5 minutes being some of the best Trek tension ever made for television. The editors needed to win all the awards. Not to mention the brilliant score composed by Saul Kaplan. This theme would eventually inspire John Williams to write the theme for Jaws.

Omega Glory: “In a battle between good and evil I’ve found that evil usually triumphs - unless good is very, very careful.” Dr. McCoy

Great list! The only questionable one for me is "Day of the Dove." Admittedly, it's hard to choose a 3rd season episode to make it into the top 20 episodes, but I'd go with "The Enterprise Incident" as perhaps a bit more adult. It's cliche to place "City on the Edge" at number 1. But it's cliche for a reason; it really is the finest hour in all of TOS. Artistically, it's sublime. TOS will always be my favorite Trek!

I love "The Gallileo Seven". It's a perfect episode that pits Spock and Bones against each other. That, the "The Empath".

The Squire of Gothos (which may have been a template for Q) and Who Mourns for Adonis are worth a mention, as is 'The Enterprise Incident' from Season 3

I became a fan of "Star Trek" through the original series and the films that had followed later on. My two favorite classic Trek episodes are "The City on the Edge of Forever" and "Space Seed" which would feature the late, great Ricardo Montalban as "Khan", who would resurface later in "Star Trek 2: The Wrath of Khan" (1982).

I can't believe that "Day of the Dove" made your list, the only third season episode to do so, when "The Enterprise Incident" is a far better, and the best, of the third season shows.

Star Trek the original series is one of my favorite shows of all time. For a couple years I watched it on a local channel every night and after several repeats I still loved it. 😊

My personal favorites: Devil in the dark, City on the edge of forever, Mirror, mirror and Amok time.

The "Doomsday Machine" and "The Balance of Terror" are my favorite Star Trek episodes❤

It needs to be mentioned that Star Trek created the modern world as we know it today.

“A Piece of the Action” & “The Conscience of the King” are a some of my personal favorites

Mirror, Mirror had the best Kirk monologue to finish the episode. Ranks #2 IMO. Agree with #1

The OG series will always the best. The Ultimate Computer, The Devil in the Dark, Tribbles, and Space Seed are my favorites.

To me the number one episode of the orignal series of Star Trek will always be: THE DOOMSDAY MACHINE.

I got my start with The Original series in 1990 via reruns recorded onto VHS. I’ve been a Trekkie since. Although, as an old school Trekkie, I’m not too keen on New Trek. In 1995 at the age of 9, as I wouldn’t turn 10 until December 27th, I was quite literally the only 9 year old in Flower Mound Texas, who could use MS-DOS and played one of the best Star Trek games ever made, Star Trek The Next Generation: A Final Unity

I was a “Latchkey kid”. This meant from age 10-18, I had a key around my neck, and was home alone, until my mom came home this was the start of franchised episodes, which was just forming. There were several shows that were featured after school, with Star Trek being one of them. My mom was in agreement with Star Trek’s values, having already teaching me of these values. Star Trek just reinforced them. Coming home everyday, and watching them after school, was kind of a ritual every day. I got to a point where, within seconds, I knew which episode it was. I, of course, remembered every episode you presented within seconds. Another one I loved, was when the Enterprise, encountered two races on a planet, and they had continually been at war for long time. Kirk first comes across one of of the aliens, whose face was White on one side, with Black on the other side. Kirk & the ship, encounters one of these races, and they are able to convince Kirk that the other is from a horrific race, which repeatedly stands with holding the other group. As it turns out, that both have Black on one side, with White on the opposite side of their face. Kirk finally encounters the “enemy” race, and realizes the argument is regarding which side of their faces featured the differences. This was broadcast during the Civil Rights movement, and was extremely relevant for the time. There is a poignant part of the of the story, where choices are made, and the story’s explanation is revealed. Gene Roddenberry was an extremely progressive storyteller, with the moral of the story, is being revealed. Thank you so much for showing this episode. I really appreciate it.

At age 73, I know most of these by rote. This was so much fun. Laughed and laughed. My god, what we remember sixty years hence. Thanks for the memories. :) PS Corbomite makes a tasty dessert topping too.

So many episodes that I love that you didn't include - The Cage, The Man Trap, The Squire of Gothos, Errand of Mercy, I Mudd, Who Mourns for Adonis and The Return of the Archons. My favourites are probably Doomsday Machine, Devil in the Dark and Arena. Big soft spot for the Immunity Syndrome too.

And the Children Shall Lead: "Evil does seek to maintain power by suppressing the truth." "Or by misleading the innocent." Spock and McCoy

Hope this continues, the Star Trek lists are long overdue for a redux.

Piece Of The Action is my favourite

I have seen every episode on this list a dozen times each. It is a very good list, quite logical. :)

Some excellent choices, I must admit I did skip to number one to see what it was - and it was what I expected! Which just goes to show how great an episode it is and how universally appreciated it is (it's one we've covered too in our group, Shatner really shines in it).

A very good list. Glad there were some less commonly recognized episodes on this list like The Menagerie and Where No Man Has Gone Before. Please do lists for TNG and DS9!

*thumbnail* Captain Kirk: "Yup, that's me. You're probably wondering how I ended up in this situation."

The Enterprise incident, Let that be your last battlefield, Tomorrow is yesterday?

I would include The Galileo Seven, which is a fantastic Spock story. A couple more from the oft overlooked season 3 are recommended too, in particular The Enterprise Incident, The Tholian Web, and All Our Yesterdays.

The city on the edge of forever was my dads favorite episode.

Finally some Shore Leave appreciation! One of the funniest episodes! I have to say, I love Star Trek, but sometimes I feel a bit lonely being a 22yo female fan of Star Trek TOS because none of my friends watch this. Even my parents watched TNG, not this. That aside, I truly think this is one of the best tv-series ever made 🖖🏻

I usually have some sort of beef with your lists, but not this one. It hit the nail on the head. Great job!

Some of my favorites not mentioned. Tomorrow is Yesterday, Assignment Earth, The Immunity Syndrome among others.

City on the edge of forever is a great episode. It was never considered the number one episode until the program dynasty with Joan Collins in it then it was associated with her, and it became known as the greatest thing ever produced.

leave "Let That Be Our Last Battlefield" out of this list is borderline criminal ...

0:27 Good Kirk: "Prepare for trouble!" Evil Kirk: "And make it double!"

Not a bad list. Third season episodes "IsThere in Truth No Beauty?" and "All Our Yesterdays" are beautiful as is "Metamorphosis" (Second season).

This show is just a lot of fun to watch. Probably because I've watched it all my life. 😂

I would have added "Let That Be Your Last Battlefield."

What about "The Empath"? It was so well acted and its storyline was so well written. It really showcased the talent of everyone in it.

The next list needs to be about the Top XX Star Trek Original Series episodes whose social commentary is just as relevant today as it was when it originally aired.

HM: "Squire of Gothos", featuring a godlike character that bears a similar personality to that of Q from TNG.

While many Star Trek actors had to develop their characters over time, Shatner had Kirk down pat from day one in 'Where no Man has gone Before.'

Miri was one of my favorites and the one when a shuttle craft smashed on the planet and white monsters with spears kept killing the crew and the one with Abe Lincoln was great as well.

Balance of Terror, Space Seed, and The City on the Edge of Forever are some of my favorites.

I always have a piece of the action.:)

When haters, purists and gatekeepers -- who have often shown they couldn't tell the difference between the USS Enterprise and the Millennium Falcon -- complain how spinoffs like Discovery are so dark, they neglected to realize one of the darkest episodes of all Star Trek was, "City On The Edge of Forever." Kirk having to let the woman he fell in love with die to save the future. And when you look at the definition of a dark story, "A story is considered dark if it tackles the stuff that would make most people uncomfortable," then Star Trek easily fits the bill, even when they sugar coat it for the 1960s. Especially when you have gruesome murders, torture, humiliation, fights to the death for entertainment, even rape as there were 3 attempted rapes on Star Trek. - Janice Rand on, "The Enemy Within," - Yeoman Barrows on, "Shore Leave," - Uhura on, "The Gamesters of Triskelion." I say attempted as SNW and the Kelvin timeline Uhura is showing to be more of a badass, but that wouldn't stop a thrall from trying, even if he may have ended up like Jack Ransom on, "Strange Energies," with multiple kicks to the groin.

Thanks for this list, Ms. Rebecca! The Original Star Trek series remains the one to beat. It may not have the cutting edge CGI effects of its successor series, but it more than made up for it with character driven stories. Nice to see The Doomsday Machine at #9; its my all time fave Star Trek episode- the scene where Capt. Kirk invoked his Executive Privelege as Captain of the Enterprise to have Mr. Spock back in command over Commodore Decker was my fave scene. One episode that should've been added was Tomorrow is Yesterday where the Enterprise is accidentally sent back to the year 1966.

Love Shore Leave, Amok time and Errand of mercy. This is a good list

I still love the Original Series. Been watching since September of 66.

City always seems to get number one on Trek TOS countdowns, but not many mention how much writer Harlan Ellison hated it. He routinely had some bad things to say about Roddenberry and felt he destroyed his script. If you want to compare, Ellison released a book where he tells the whole story, as well as reprinting his original version. There's also a graphic novel that has his original version as well. I personally think both have good elements, but I don't know which I'd prefer.

iirc Mirror Mirror was the basis for Transformers: Shattered Glass

"All our yesterdays" was a brilliant concept, even if the episode itself wasn't too exciting

Three episodes: 'Conscience of the King'. Fantastic piece of writing and provides some interesting backstory for Kirk. 'Errand of Mercy': Introduces the Klingons with the fantastic John Colicos as Commander Kor. 'The Galileo Seven': Spock's reliance on logic sometimes fail. Great acting and writing and a great showcase of using conflict to tell a story.

"The Trouble With Tribbles" and the Star Trek Deep Space Nine crossover story ..... MY FAVOURITE ..... 😀

Spock’s Brain should be #2!!!!! And don’t forget “gonna click my heels and jump for joy, I got a clean bill of health from Dr. McCoy!” That episode pissed James Doohan off to no end…

I confess to being suprised when Amok Time came in at #5, as its often hailed as one of the 2 best episodes along with City, but I can't argue with the other 3 you put ahead of it (Tribbles, Space Seed and Terror) either. It's a pretty good list. The Squire of Gothos, Errand of Mercy and The Empath could also have made the list.

The second season's 'The Ultimate Computer' was a memorable episode. A stand out performance by mad computer scientist William Marshall, aka Blacula.

Spock: Captain, I am pleased to see you're still alive. Kirk: Yes, I'm rather pleased myself! 😂

There are so many great episodes on Star Trek the original series it would be impossible to place them in any kind of order. I think your picks are pretty good.

My #1 didn't even make the list: Let That Be Your Last Battlefield. The story and visuals just show how the impact of racism in such poignant way.

It is awesome to watch Star Trek on television

"Spock's Father is a Romulan spy!" My remark after first seeing Journey To Babel at the age of nine.

Mirror Mirror Evil Spock with a beard was classic 🖖

00:17 The Enemy Within 1:25 The Devil in the Dark 2:25 The Ultimate Computer 3:20 Shore Leve 4:06 A Taste of Armageddon 5:10 This Side of Paradise 6:10 Day of the Dove 7:07 The Menagerie 8:10 Where no Man has Gone Before 8:52 The Corbomite Maneuver 9:41 The Naked Time 10:19 The Doomsday Machine 11:17 Arena 11:49 Mirror Mirror 12:31 Journey to Babel 13:16 Amok Time 14:21 The Trouble with Tribles 14:53 Space Seed 15:26 Balance of Terror 16:40 The City on The Edge of Forever

12:02 Ohura is ripped!

I rewatch the original every year

My matrix class last year, and the Big Bang theory got me to watch and sort of like Star Trek

🖖😎👍Very cool and very nicely well done and executed and informatively explained in every detail way shape and form provided on this format and subject matter on the various Top 20 original Startrek series episodes indeed!, A job very wonderfully well done Young Lady!👌.

The City on the Edge of Forever is written by one of my favourite authors Harlan Ellison. He also wrote an episode on Outer Limits that James Cameron ripped off when he wrote The Terminator.

"The Doomsday Machine" should be higher up. Best episode ever, and it has been my favorite ever since I was little. I loved every episode but I never understood why "The City on the Edge of Forever" was everyone's favorite.

While Harlan Ellison's masterpiece was always going to be #1, the complete omission of my personal #2 is surprising. Season one's Errand of Mercy was a joy from start to finish. In fact, I'd argue that John Colicos' glorious scene chewing was never bettered by any guest star.

Star Trek Continues - a sequel of Star Trek The Original Series that continued where they left off and it was pure unadulterated awesomeness.

Love your content, WatchMojo!

The Trouble with Tribbles has always been my personal favorite.

At least you guys mentioned "APiece of the Action", and "The Squire of Gothos" set up the future appearance of "Q"

Balance of Terror is perhaps the greatest episode of television drama ever created.

William Shatner: "When did Star Trek become so political?" Fans: "You were LITERALLY there!"

Yes, City on the Edge of Forever is the best, but Metamorphosis is a solid second best. Plus introducing Zefram Cochrane!!

Since I was born and raised with TNG and onward I do love TOS ST. One of my favorite shows. I wished it did less to season 5

The Cloud Minders. An underestimated one from season 3

Fry: Episode 10. Balance of Terror. Melllvar: More like episode 9!

One of my favourite episodes has always been Let That Be Your Last Battlefield. An absolute brilliant episode showing the stupidly of racism and prejudice.

I like the Trouble With Tribbles episode. Especially with all those adorable furballs that multiply.

I thought for a moment there you were going to say Number 1, Spock's Brain .... Only kidding.

Balance of Terror is my number One.

7:37 - 7:51 That’s pretty cool

I think they're all great with the possible exception of spectre of the gun

Always a fan of horror, The Devil in the Dark has always been my favorite. I remember watching this as a kid in the 70's, and this episode scared me to death.

Just a casual reminder the TOS & TNG are the reasons behind many of the inventions we as a society have used over the last 2+ decades.

Mirror Mirror also introduced a theme to subsequent Star Trek series, the Mirror universe, seen in Deep Space Nine, Discovery, Enterprise and Picard. There's also a fun sequel to The Trouble With Tribbles done for Deep Space Nine. Special mention for Tomorrow Is Yesterday, when the original Enterprise crew have to sort out a time travel incident, something that happened in other Star Trek series. The parallel Earth type worlds in several stories are good and I would also add Let This Be Your Last Battlefield, a chilling study of racism gone out of control.

Glad to see Day of the Dove on this list. Space Seed belongs nowhere near this list. Should have considered the one with the longest title in all of Trek - For the World is Hollow and I Have Touched the Sky.

It also helps to watch the Original Series according to production number and not air date.

Good choice of top 20 episodes of Star Trek the original series 😊

One fact you forgot to mention is that "The Naked Time" was the source of the plot of ST:TNG episode "The Naked Now."

20, a wise and touching lesson about learning to accept both our light and dark sides. Reminds me of Dr. Jekyll and Mr. Hyde. 19, reminds me of an episode of Star Trek the Next Generation, where the heroes encounter a strange jelly fish like creature that can turn into a city. 5, I remember watching an episode of Dexter's Laboratory where Dexter was in a Star Trek like episode and had to fight a woman with the same kind of weapons from Amok Time. I use to wonder where they got that idea from in which Star Trek episode, now I finally know where.

15:05--He's DONE!!!!

Good list. 👍🎬😎 I'd include "Tomorrow is Yerterday", "Court Martial", "The Squire of Gothos", "The Galileo Seven", "Paterns of Force" and "The Enterprise Incident" 😉