* "The Devil in the Dark" when Kirk and Spock resolve the situation by ShamingTheMob with the revelation that the Horta MonsterIsAMommy, and then propose a solution to resolve the situation, which works perfectly with both populations ending the story living and prospering together in peace. The head of the operation even calls Kirk to tell him how well they're getting along.
** The whole episode is a meta-CMOHW when you know that WilliamShatner received news of his father's death the day before filming, and was scheduled to ship out later that day. Spock's personal space bubble is as small as it ever was in this episode, as LeonardNimoy lends Shatner his support. Shatner later recounts his gratitude for the support of the other actors, particularly LeonardNimoy and DeForestKelley, likening it to the way elephant herds will converge around the bereaved, offering silent comfort.
** There's also [=McCoy=] successfully curing the Horta, despite being [[ImADoctorNotAPlaceholder a doctor, not a bricklayer]].
---> '''[=McCoy=]''': My God Jim, I'm beginning to think I can cure a rainy day!
** When part of the roof caves in and Spock hears, he tries to contact Kirk. When there's no reply, he instantly moves faster and even drops the formality of calling him "Captain", instead calling out "Jim". Spock may hide his emotions, but anyone can tell that for that moment, Spock was worried his friend had been killed.
* In the otherwise clunky "Requiem for Methuselah" after Kirk is emotionally devastated by the events of the episode, Spock and [=McCoy=] come to his quarters. [=McCoy=], after delivering his final report, proceeds to upbraid Spock for his lack of "love". As [=McCoy=] departs, Spock leans over his captain's sleeping body and performs a mind meld with just one word: "Forget." Truly, this is ''the'' moment where we see just how deeply Spock cares for his captain... and his friend.
** Also, fun with HoYay!
** Spock's unwavering loyalty extends beyond his friendship to Kirk. The entire episode "The Menagerie" dealt with his loyalty to his first CO, Captain Chris Pike. The episode ends on a massive CrowningMomentOfHeartwarming when the Talosians give their "gift" to Captain Pike.
*** And when Spock explains his need for deception instead of revealing everything from the beginning.
---->'''Kirk:''' Even though regulations are explicit, you could have come to me and explained.
---->'''Spock:''' Ask you to face the death penalty too? No, one of us was enough.
* This troper found the emotional outburst that Spock nearly had in "Amok Time" after learning that he ''didn't'' actually kill the captain to be the biggest CrowningMomentOfHeartwarming in the entire show. ([[http://www.youtube.com/watch?v=I5pocMUIWwU Watch!]])
** It was the one and only time in the entire series where Spock smiles of his own free will and volition. Of course it was the best...
--->'' "Jim!" ''
** After Spock believes Kirk was killed, his farewell to T'Pau truly shows how much he cares for Kirk:
--->'''T'Pau:''' Live long and prosper, Spock.
--->'''Spock:''' I shall do neither. I have killed my captain and my friend.
** A slightly fridgey one: Spock's PleaseSpareHimMyLiege moment when T'Pring selects Kirk as her champion. He wasn't even supposed to be capable of coherent thought at the moment. It gets better when T'Pau demeans him for his human behavior and Spock doesn't stop. As much as he fears being humiliated in front of "his" people, he feared more to let Kirk die without attempting to save him.
** Spock asking Chapel to make him plomeek soup. Having vehemently (and very publicly) repudiated her for the same gesture earlier in the episode, knowing she has feelings for him that he can't share, he still sees that his illness is upsetting her and is able to accept her mercy and ''call her by her first name.''
** There's another, smaller one later on. Spock explains that the groom's 2 best friends are allowed to witness the wedding, and invites Jim and ''[=McCoy=]'' to come along. Really shows how much he considers [[VitriolicBestBuds [=McCoy=]]] a friend.
*** And Bones, ever the Southern gentleman, answers with a [[SincerityMode sincere]], "I shall be honored, sir."
** Early on in the wedding, T'Pau gives Kirk and Bones the option to back out of their participation in what is sure to be a very gruesome ceremony. They opt to stay and support Spock instead.
--->'''T'Pau:''' Spock has chosen his friends well.
* "The Empath," where, being told that one of them will be subjected to torture that will leave them either near-death or insane, [=McCoy=] [[MoreExpendableThanYou knocks out both Kirk and Spock so that he will be chosen]].
** This episode was just filled with heartwarming. First there's [=McCoy=] rasping "You've got a good bedside manner, Spock," as Spock tenderly cradles his face. Then when he regains consciousness to find Gem [[EmpathicHealer absorbing his injuries]], he tries to push her away, physician to the last:
---> '''Bones:''' Don't let her touch me. She'll die. Jim... I can't destroy life, even if it's to save my own. I can't. You know that. I can't let you do it.
** Also, earlier in the episode, after [=McCoy=] had drugged an injured Jim to sleep, Gem was watching Spock, who was looking worriedly at his sleeping captain. Not quite understanding the emotion, she reached out and touched Spock's shoulder, before finally realizing why. The smile on her face afterwards says it all.
* In "The Ultimate Computer," when Kirk thinks he's been rendered superfluous as a captain, Spock and Bones, each in his own way, rally round him. First Spock tells him firmly that "a starship...runs on loyalty to one man, and nothing can replace it or him;" then [=McCoy=] brings him a drink, and when Kirk bitterly toasts to "Captain Dunsel," the doctor puts a hand on his arm and quietly corrects, "To Captain James T. Kirk." What follows is an iconic Kirk speech that's a CrowningMomentOfHeartwarming in its own right:
--->'''Kirk''': Do you know the one: "All I ask is a tall ship and a star to steer her by...?" You could feel the wind at your back in those days, the sounds of the sea beneath you. And even if you take away the wind and the water, it's still the same. The ship is yours, you can feel her...and the stars are still there.
** This is followed up years later in ''Film/StarTrekVTheFinalFrontier'' as they approach the Enterprise-A in the shuttle, where Spock and Bones, bickering couple that they are, argue over who the author of the poem was. It's called back even later in ''Series/StarTrekDeepSpaceNine'', as the dedication plaque of the USS ''Defiant'' actually bears the same John Masefield quote.
* "The City on the Edge of Forever": Kirk and Spock [[spoiler: finally find [=McCoy=], who they'd been separated from for the duration of the episode.]] Jim and Bones shout each other's names and hug - ''and '''Spock''' runs forward at the same moment,'' shooting his arm out as if to join in the embrace. In the next shot, he's shaking the doctor's hand quite earnestly.
** [[DownerEnding But]] [[KillTheCutie then]] it got worse.
** Spock answering [=McCoy=]'s "Do you realize what you've done?", because Kirk is too broken to respond at the moment.
* ''Journey to Babel''. That it's played so deadpan makes it even more CrowningMomentOfHeartwarming.
-->'''Spock:''' Emotional, isn't she?
-->'''Sarek:''' She has always been that way.
-->'''Spock:''' Indeed - why did you marry her?
-->'''Sarek:''' At the time, it seemed the logical thing to do.
* [[http://www.youtube.com/watch?v=3b56e0u0EgQ This]] scene in ''The Omega Glory'', where Captain Kirk reads out the preamble to the US Constitution. It doesn't matter if you're not American; the scene, Kirk's [[NarmCharm absolute intensity and honest belief in the words and most of all the music that plays]] makes it so very heartwarming.
* The exchange between Spock and [=McCoy=] in ''The Immunity Syndrome''. May Double as a CrowningMomentOfFunny.
-->'''[=McCoy=]''': "Shut up Spock, we're rescuing you!"
-->'''Spock''': "Why, thank you, ''Captain'' [=McCoy.=]"
* There's also the scene in ''The Tholian Web'' were, after having rescued Kirk, both Spock and [=McCoy=] deny having reviewed Kirk's final taped orders to them.
** Kirk's taped orders were a pretty Crowning Moment, too. He knows his friends so well he was able to predict their actions and mediate between them even from beyond the grave. Well, sort of.
** Also, this line from Spock after [=McCoy=], who between Kirk's death and the effects of the space they're in, has gotten snippy with him:
-->'''Spock''': I believe [Kirk] would have said, "Forget it, Bones."
* In ''[[Recap/StarTrekS1E14BalanceOfTerror Balance Of Terror]]'', late in the story, Scotty reports that the control room for the ship's phasers is being manned by one person. Lieutenant Stiles, the navigator, volunteers to assist as his first assignment was as a phaser controller. Kirk agrees and asks Uhura to take his place at navigation. What is not stated, or even commented upon, is that with Sulu already at his station, this means the ''Enterprise'' is now being operated by a black woman and an asian man. Nobody comments on this, nobody wonders about that, they just accept it as perfectly natural. With no dialogue or [[AnAesop a heavy handed message]], the show features just a natural acceptance across gender and racial lines.
** Let's not forget the episode in which Uhura and Kirk kissed - the first integrated kiss broadcast on Television. The best part about this was two versions of the scene were supposed to be filmed; one with the kiss and one without. But both Shatner and Nichols purposely messed up the second take so it couldn't be used.
* As cheesy as "The Way To Eden" is, Spock delivers a wonderfully uplifting line near the end:
-->'''Spock:''' Miss Galliulin. It is my sincere wish that you do not give up your search for Eden. I have no doubt but that you will find it, or make it yourselves.
* In "Plato's Stephchildren", Uhura tells Kirk that anytime she felt afraid, she would calm herself by reminding herself that Kirk was in charge so things wouldn't go completely wrong. [[MoodWhiplash Then he kisses her.]]
* In "The Naked Time", after Uhura apologizes for getting snippy with Kirk, he apologizes for being snippy with her first. It takes a big man to apologize like that.
* In "Whom Gods Destroy", this exchange:
-->'''Kirk''': They had a dream, a dream that became a reality and spread throughout the stars. A dream that made Mr. Spock and me [[HeterosexualLifePartners brothers]].
-->'''Garth''': Mr. Spock! Do you consider Captain Kirk and yourself brothers?
-->'''Spock''': Captain Kirk speaks [[CaptainObvious somewhat figuratively]], and with undue emotion. However, what he says is logical, and I do, in fact, agree with it.
** Another example from the same episode. Kirk tries to talk down the maniacal Garth by reminding him of what a hero he is to the Federation and to Kirk, personally, for being the model for all other starship captains. For an instant, Garth looks and sounds normal. "I do remember that. It was a great responsibility, but one I was proud to bear." Unfortunately it does not last, but after Garth is subdued and cured of his insanity, he acts as if he is waking from a dream and the first thing he does is offer a handshake to Kirk.
-->'''Garth''': "Should I know you, sir?"
* In "That Which Survives", Spock's extreme Vulcanness is implied to be a sign that he's worried about Kirk. Then, later in the episode, he refuses to take Scotty's TheNeedsOfTheMany offer to jettison a malfunctioning part (and him with it).
* The IWillOnlySlowYouDown / NoOneGetsLeftBehind moment between Spock and [=McCoy=] in "All Our Yesterdays". What makes it even more heartwarming is that the person on each side wasn't who you would think.
-->'''[=McCoy=]''': I can't go on. Go without me.
-->'''Spock''': We go together or not at all.
-->'''[=McCoy=]''': Don't be a fool! My legs and hands are frostbitten; I can't feel my feet. Alone you have a chance. Go, try to find Jim.
-->'''Spock''' (pulling [=McCoy=] to his feet): We go together!
* On a meta level, some people might not know from watching the show. But James Doohan felt a great deal of animosity toward William Shatner for many years. However, while writing a book about on Star Trek, Shatner asked Doohan if he'd like to collaborate with him on the project. Doohan agreed and both men appeared to walk away from the experience on amicable terms.