First, you kinda had to be there...

Star Trek: The Motion Picture kind of went over like a wet fart in church. People really didn't like it.

So II rolls up, changes the uniform styles, brings back a classic villain, a tense, action driven script, and emulates Balance of Terror which is quite possibly the best TOS episode.

Then, following it up is Search For Spock which was mostly forgettable. Then Voyage Home which is just as well liked as II.

That started the early meme of "odd numbered ones suck, even numbered ones are good."

Which held for V and VI as well.

Oh, where do I start?

It’s a really, really tight script, for one, with little or no filler. Unlike TMP, it moves swiftly from scene to scene, from setup to setup, establishing its themes of mortality, aging, the inability to let go of the past, the tragedy and joy of moving forward, of rebirth right off the bat, in so subtle ways that most don’t catch it until later or a rewatch.

For fanservice, it makes good use of a loose end from TOS continuity which is simple enough for non-fans to get without much exposition, and memorable enough that old viewers will remember it. The relationship between the Big Three is no longer as broken as it was throughout most of TMP, and the banter naturalistic and enjoyable, even among the supporting crew.

Nick Meyer adds all these little touches in the background that make it ripe for literary analysis. A Tale of Two Cities and its themes of sacrifice, Kirk’s fondness for antiques, never really established before, echoing his nostalgia for times past. In Khan’s cargo carrier, you see on the shelf as Chekov discovers the SS Botany Bay tag: Dante’s Inferno, stacked on top of Milton’s Paradise Lost/Paradise Regained, stacked on top of Moby Dick, showing the progression of Khan’s experiences on Ceti Alpha V, echoing his hope in reference to Milton at the end of “Space Seed” - to rule in Hell, build his own Paradise - now replaced by obsessive revenge.

ST II also sets up TNG, in its way, by introducing Peter Preston, David Marcus and Saavik - essentially Scotty, Kirk and Spock’s offspring - the next generation of voyagers that the old guard are trying to give way to, but the past just won’t let them and indeed threatens that legacy.

And then of course there’s the space battles - never really as well executed due to SFX limitations in TOS - but yet leaning so completely into the nautical and submarine metaphor established by Roddenberry and “Balance of Terror”. It was a risky move in an era dominated by adrenaline-fueled Star Wars dogfight-like starship combat, but Meyers’ direction made it work. There’s never a time you don’t know exactly what’s going on in that battle, or what tactics the two sides are employing.

You’re right in the sense that it’s not traditionally what one expects of Star Trek, leaning more into the pulp adventure mold rather than the aliens and exploration mold. But to a degree it’s still an optimistic future. Kirk’s son and Spock’s daughter ready to take the reins, the Genesis Planet representing the potential for new life, Kirk himself experiencing a rebirth of sorts as he finds his youth restored as his best friends told him it would be - on the bridge of a starship. But who says the final frontier can’t be inside us, too? (Archer said as much)

And in the end, it’s a complete movie. The forced-on-Meyer shot of Spock’s torpedo casing notwithstanding, it’s a complete story from start to finish, with no “The Human Adventure Is Just Beginning” tease or the sequelitist tones of the next two movies. All the information you need to know is in here. You could watch it without tying it to a larger universe and be completely satisfied with the experience. All you really need to know beforehand is that it’s connected to this TV show from the 60s.

I've always maintained that TWOK is not just a really good Star Trek movie, not just a really good science fiction movie, but a really good movie period. It transcends the franchise and the genre, which I don't think can be said of any other Trek movie.

It's a movie that's about something meaningful - getting older, confronting mortality and legacy, and renewal through sacrifice. Kirk starts out feeling old, worn out, but ends with him saying "I feel young". Maybe it's a little trite when put so bluntly, but it's executed in an elegant and impactful way.

TWOK evolves Kirk in a way we hadn't seen before. He is a different person at the end of the movie than he was at the beginning (or throughout the TV show). Less cocky, more aware of the consequences of his actions, because it literally cost him his best friend.

Spock's death scene was the first time Star Trek ever made me cry. You can argue that TWOK is more militaristic than Star Trek normally was, but the themes of friendship, loyalty and sacrifice is pure Trek idealism. One could even argue that TWOK is about exploration, but an inner journey not an external one: Kirk encounters for the first time (by which I mean in a way that truly hits him) "death, the undiscovered country" (the film's working title).

In David Marcus and Saavik TWOK introduces what might have been a new generation of characters, to whom the torch might have been passed if they hadn't been killed off and sent to the home for pregnant Vulcans, respectively, in later movies. In either case, these two new characters - especially in light of Spock's death (a death sadly temporary, to the franchise's long-term detriment) - tie into the themes of mortality and legacy.

TWOK has what's arguably Shatner's finest performance - certainly in Star Trek, maybe ever. Everyone else is also in top form.

TWOK has the best antagonist. So compelling was Khan that they keep on trying to remake the "so-and-so is out for revenge" story. Montalban was so good Paramount even launched a "For Your Consideration" campaign to get him a Best Supporting Actor Oscar nod. And Montalban's Khan easily has the best chest of any Trek villain.

Even though Khan is the best villain, Khan and Kirk actually never physically meet. Their entire confrontation is carried out over comms. They never get into a fistfight or even breathe the same air, something that took me years to realise. Because theirs feels like the most visceral, tense and personal battle of any movie.

Even though TWOK was made on a very limited budget, a lot of the production design and visual/special effects hold up - there's a reason why Robert Fletcher's monster maroons are so iconic for instance. So many effective little moments. Eg the Genesis simulation (one of the first uses of CGI in a movie), though primitive by today's standards, still looks really cool because of the way it was storyboarded by ILM, with the camera sweeping ahead of the Genesis effect, then the effect catching up to it.

The battle scenes have real weight. I've always thought that Meyer's conceptualisation of starships as capital ships - rather than as jetfighters - made for better fight scenes. The entire movie is basically Roddenberry's "Horatio Hornblower in space" idea realised (hence touches like the bosun's whistle and the old-fashioned look of the uniforms), an idea which carried over to how he staged the battles, with Enterprise and Reliant squaring off like galleons at sea.

Speaking of battle sequences, the "gatling gun" phaser effect is still the best phaser effect in Trek. And you've never felt the pain of the ship getting hit as acutely as the "can opener" shot: another example of a shot which is unremarkable at a technical level today, but which still has an emotional impact. Ditto the Ceti eels.

Horner's music is arguably the best of any of the movies. There are individual tracks in other movies that might rank alongside or above the best of Horner's tracks - eg Goldsmith's First Contact theme or Giacchino's "Enterprising Young Men" - but as a whole I don't think you can surpass TWOK's score.

There are so many iconic moments and lines. "Aren't you dead?", the Dickens and Melville quotes, "I never forget a face, Mr... Chekov", "I don't like to lose", "He's so... human. / Nobody's perfect Mr Saavik", "I have been and always will be your friend", "Of all the souls I have encountered in my travels, his was the most... human".

Is it a perfect movie? No. Eg while a lot of production design works, some of it looks cheesy (like Meyer's obsession with blinkety lights). Some of the supporting characters aren't utilised as well as they might have been. (But then, the TOS movies have all been Kirk movies - it's worth remembering that TOS was not an ensemble show, but one with a clear primary, secondary and tertiary character.) But the elements in TWOK that don't quite work don't detract from its overall impact and quality.

There's almost too many good things to make a coherent summary, so let me list some high points: Khan is a tie back to Space Seed, an original series episode featuring Ricardo Montalban. Also, James Horner's sound track was incredible. Kirk's Explosive Reply and Surprise Attack almost tell the story all by themselves. Then there's the well paced storytelling of the cat and mouse battle between Enterprise and Reliant. Throw in some dark sci-fi elements (possibly Alien inspired) like the ear bugs and the abandoned science station filled with rats and dead bodies. There's the Trekish ethical/moral plot of making Genesis vs using it (not unlike Oppenheimer). The self exploration of a middle aged Kirk who's realized he's getting older and regrets missing out on a family. The no win scenario and the loss of Spock. Spock's death is a powerful scene that plays Vulcan logic against human emotion on the stage of a deep friendship. Generally, the film transforms Kirk into a three dimensional character. Those are a few things.

Edit: spelling

I'm glad somebody else has brought up that TWoK sort of feels at odds with Trek despite being the best of the films. However, I say it is still the best Trek movie because:

It focuses on the characters who know from Star Trek, and their growth, change, loss, and acceptance is critical to the story. While the things that happen to them aren't limited to Trek characters, Kirk, Spock, et al. were the definition of "Star Trek" at the time.

The militaristic aspects aren't totally foreign to Star Trek. While exploration was always at the forefront of their mission, Starfleet was (as Carol Marcus pointed out) still a military organization. What has happened is that the exploration/scientific aspects in the story have been initially shifted to Dr. Marcus.

The sci-fi aspects and story telling are still very strong, it's just that Kirk and Khan shooting each other in a nebula is so great that we forget they're there.

• What are the ramifications of a device like Genesis, which puts a civilization even closer to the ability to "play god?" Is every tool that can create also doomed to be a weapon that can destroy?
• How does a future society balance the often competing goals of scientific exploration with military power, especially given something like Genesis?
• What responsibilities do we have when we decide to "play god" within a much smaller microcosm such as Khan's people. Kirk presumed he was doing the right and just thing by setting them up on a planet but never returned to check on them. Was he responsible for what happened to Khan as a result?

The increased breathing room of a full motion picture that doesn't have to delve into the backgrounds of the characters we already know gives the story room to breath, and unlike TOS we have time to let events that aren't driven strictly by the "gimmick" of the scifi aspect intermingle and impact with the plot device(s).

I still hold that TMP is the most "Trek" of the movies, but TWoK is the best of the movies while still being sufficiently "Trek."