->'''Lt. [=McGivers=]:''' I don't know if you'll like living in our time.
->'''Khan:''' Then I'll have to remold it to my liking.

[[caption-width-right:331:[[AVillainNamedKhan Khan Noonian Singh]]. [[AffablyEvil Charming. Sociable.]] [[EvilOverlord Tortures people who don't give him what he wants.]]]]

The episode which was the basis for ''Film/StarTrekIITheWrathOfKhan''.

It all begins when the ''Enterprise'' comes across the S.S. ''Botany Bay'', an apparent derelict from [[TwentyMinutesIntoTheFuture the 1990s]], which the characters [[AsYouKnow handily remind each other]] was when Earth was nearly destroyed in a world-wide war which was ''[[RetCon not]]'' WorldWarIII. This war was caused by [[ForScience scientists]] creating [[BewareTheSuperman genetically-superior humans]]. These superhumans decided to TakeOverTheWorld, but ultimately ended up fighting amongst themselves.

Kirk, Bones, Scotty and Lt. Marla [=McGivers=] (our GirlOfTheWeek) beam onto the ''Botany Bay'', finding it full of {{Human Popsicle}}s. Creator/RicardoMontalban, who [[FakeNationality we're told is Indian]], wakes up and [=McGivers=] falls in LoveAtFirstSight. In Sickbay, he's discovered to be superhuman, holds a knife to [=McCoy's=] throat and says his name is "Khan", but refuses to answer any other question. Kirk decides it's a good idea to let Khan look at all the technical information on the ''Enterprise''. Meanwhile, [=McGivers=] gets to have a rather lame love scene with Khan in which we learn she wears her hair in a 1960s updo (which looks uncannily like a wig) because it's "comfortable."

Kirk and Spock question Khan some more and he as good as admits that he was one of the superhuman {{Evil Overlord}}s from the '90s. Since EvilIsSexy, [=McGivers=] takes Khan's side and apologizes to him for how rude everyone else was. He then manipulates her feeble [[ValuesDissonance female]] mind into agreeing to help him hijack the ship. With her help, he unfreezes his EvilMinions and takes over Engineering. It turns out he actually learned a bit from those tech manuals and cuts off life-support systems to the bridge. After everyone has passed out, he treats them to Kirk's torture in a decompression chamber, offering to let him live if someone joins him.

At this point, [=McGivers=] [[HeelFaceRevolvingDoor has had enough]] and [[HighHeelFaceTurn sets Kirk free]], begging him to let Khan live. This leads to Kirk and Khan's {{Stunt Double}}s having a big ProfessionalWrestling-style fight which ends in Khan's defeat despite his superior strength due to Kirk breaking off a mechanical lever from the ship as an ImprovisedWeapon. Kirk and Khan agree that he and his followers will be dumped on the savage planet Ceti Alpha V, providing Khan the opportunity to build his own empire. [=McGivers=] decides to go with Khan rather than face court-martial. Kirk and Spock speculate about what will become of them:

->'''Spock:''' It would be interesting, Captain, to return to that world in a hundred years and [[TitleDrop learn what crop had sprung from the seed you planted today]].\\
'''Kirk:''' [[{{Irony}} Yes, Mr. Spock.]] It would indeed.

The FanNickname for this episode is, of course, "{{The One with}} Khan".
!!This episode includes the following tropes:
* AbsenteeActor: Sulu doesno't appear in this episode. He was replaced by Makee K. Blaisdell as Lt. Spinelli.
* AllThereInTheScript: In the original script, the Botany Bay's log stated that the ship was originally headed for the Tau Ceti star system. Examination of the ship reveals a damaged steering system, which has sent the Botany Bay careening off-course into deep space.
* AdmiringTheAbomination: Kirk, Bones and Scotty give Spock a good shake when they admit a certain admiration for Khan, even if they still acknowledge he's evil.
* AffablyEvil: Khan. He's surprisingly charming and polite for being a former dictator. Or not, considering how many dictators have come to power through charm and charisma.
* AmbitionIsEvil: As Spock describes Khan and his fellow augments, "Superior ability breeds superior ambition."
* BadassBookworm: [=McCoy=] tells Khan to "[[GetItOverWith make up [his] mind]]" how to kill him and even tells him the "most effective" way to do it. Even Khan is impressed.
-->'''[=McCoy=]:''' It would be most effective if you would cut the carotid artery, just under the left ear.
-->'''Khan:''' ''(releases him)'' I like a brave man.
-->'''[=McCoy=]:''' ''(humbly)'' I was simply trying to avoid an argument.
* BadassNormal: Kirk. He beats the tar out of a supposed "superman" with nothing but his bare fists and a PVC pipe.
* BewareTheSuperman[=/=]NoTranshumanismAllowed: Khan is the ''reason'' why, as far forward as ''Series/StarTrekDeepSpaceNine'', BioAugmentation is forbidden.
* BornInTheWrongCentury: Marla feels this of herself, preferring to be in the more "adventurous" 1990's.
* DeathGlare: One of Khan's {{Mook}}s [[WouldHitAGirl smacks Uhura]] when she hesitates to carry out Khan's order. Good thing Marla intervenes, because by the looks of Uhura's face, she was about to seriously beat that guy's ass.
* [[DieHardOnAnX Die Hard on the Enterprise]]: The UrExample of this as far as the ''Star Trek'' franchise goes (and there would be ''a lot'' more examples - we're looking at you, ''[[Series/StarTrekEnterprise Enterprise]]''). Kirk and his crew have to sneak through the ''Enterprise'' to undermine Khan and his followers.
* DoesNotLikeShoes: Khan's female followers all wear form fitting bodysuits, but no shoes.
* DoomedByCanon: Marla won't survive to the events of ''Star Trek II''.
* EvilCounterpart: One of the reasons Khan became so popular; he is a perfect match for Kirk in both fighting prowess and strategic capability.
* EvilOverlord: Khan, with charisma to spare. You think this episode is bad, wait'll you see ''Wrath Of Khan!''
* FanGirl: [=McGivers=] is one for, as Khan puts it, "bold men from the past", such as Leif Erikson, UsefulNotes/RichardTheLionHeart, UsefulNotes/NapoleonBonaparte, [[FamousFamousFictional and Khan himself]]. She even draws FanArt of them!
* ForcedToWatch: In one of Khan's nastier moments, he makes the crew watch Kirk suffocate in an effort to force them to follow him.
* {{Foreshadowing}}: Probably unintended at the time, but Spock's musing on what they would find upon returning to the planet on a later occasion essentially serves as a SequelHook leading into ''Film/StarTrekIITheWrathOfKhan.''
* TheGuardsMustBeCrazy: Khan, a superstrong megalomaniac, is being held in a room with ''one'' guard outside the door. He busts out and flattens the guard in short order. At least in the resulting trial, the RedShirt bailiffs are too smart to allow that stunt again and have multiple ones holding him at phaser point to make sure he behaves himself.
* HighHeelFaceTurn: [=McGivers=], after a manner of speaking. She still loves Khan, but she is unwilling to watch him execute her captain and the other officers.
* {{Human Popsicle}}s: Khan and Company, before being woken up.
* ICantLookGesture: Uhura turns off the viewing screen [[ForcedToWatch on which Khan is showing them Kirk suffocating.]]
* IdiotBall: Hey Kirk, really think it's a good idea to let the superpowered stranger get complete access to the technical blueprints of the ship?
** Hey Kirk, do you think the girl who is enamored with the ambitious superman who is able to manipulate people should be allowed to hang out with him that much?
* InnocuouslyImportantEpisode: At first glance, it seems like another example of episodic 60's-era TV: a bad guy named Khan tries to take over the Enterprise, Kirk outwits him and exiles him and his followers to an uninhabited planet, life goes on. Then Khan returns in ''Film/StarTrekIITheWrathOfKhan'', and the ensuing events greatly influence the rest of the TOS-era movies and set up some plot points for the subsequent Trek TV series and the reboot movies.
* InstantSedation: Of the gas variety. Khan escapes the briefing room before it can affect him. Scotty also escapes, but clearly got a mouthful and is noticeably weakened.
* KickTheDog: One of Khan's men slaps Uhura after she shoots him a DeathGlare.
* LettingHerHairDown: Marla does this for Khan after he criticizes her updo.
* ALighterShadeOfBlack: While still an EvilOverlord, Khan is said to have been the most benevolent of all the genetic supermen, ordering no massacres and never waging wars until he was attacked.
* MeaningfulName: The ''Botany Bay'' is named after Great Britain's first penal colony in Australia.
* NamesToRunAwayFromReallyFast: Come on, Kirk, his name is ''[[UsefulNotes/GenghisKhan Khan]]''. WhyDontYaJustShootHim
** Of course, technically, "Khan" is his title, not his name, which is "Noonian Singh."
* NoGoodDeedGoesUnpunished: Kirk takes in Khan and his men after he finds them floating in space and on the verge of dying when their ship systems fail. Khan returns the favor by [[UngratefulBastard attempting to kill Kirk and take over his ship]]. Much, much later, in ''Film/StarTrekIITheWrathOfKhan'', Chekov calls out Khan for this, pointing out that Khan and his people were marooned precisely because of this.
* NostalgiaFilter: Pointed out by Spock InUniverse. The human command crew view Khan through distant centuries, remembering him from their history classes fondly as the least evil of the Eugenics Wars' genetic supermen and they have the impression he was 'firm but fair'. Spock has a different and, it turns out, more accurate perspective that Khan was still a ruthless tyrant. This is probably meant to reflect how people romanticize historical figures like Napoleon and, indeed, Genghis Khan, as well as the old saying that Mussolini 'made the trains run on time'. (In fact, [=McGivers=] lovingly lists Napoleon as one of the figures whom Khan reminds her of.)
** That said, Kirk argues that they may admire him on some level but are still aware of who he is. Given that episode ends with Kirk exiling him on a uncivilized planet, preventing him from harming anyone but still giving him a chance to create civilization on his terms, the story arguably supports his view of Khan more than Spock's.
* ObviousStuntDouble: The fight between Creator/RicardoMontalban's stuntman and whoever was doubling for Creator/WilliamShatner.
* ObviouslyEvil: Khan might as well have "Supervillain" stamped on his forehead.
* {{Pride}}: Khan's FatalFlaw.
* PutOnABus: Khan and his followers. [[TheBusCameBack It came back]], [[Film/StarTrekIITheWrathOfKhan though]].
* TheRightOfASuperiorSpecies: The supermen.
* SacredHospitality: Khan tramples all over it.
* SealedEvilInACan: Khan Noonien Singh and his cryogenically frozen followers.
* SmugSuper: Khan, full stop. He has no problem telling Kirk and Co. to their faces that they are "honestly inferior."
* TheSocialDarwinist: This is Khan ''full stop''--and a large part of the reason he is so horrible.
* SuperStrength: Khan can crush a phaser in his hands, pull open the door to his quarters on the ''Enterprise'' unaided, and effortlessly throw Kirk across the room.
* TakeOverTheWorld: Seemingly Khan's objective.
* TakingYouWithMe: With Khan's plan to take the ''Enterprise'' going south, he activates the SelfDestructMechanism, forcing Kirk to take him out and shut the sequence down.
* TwentyMinutesIntoTheFuture:
** The establishment of the Eugenics Wars in the 1990s naturally caused the franchise some problems when it was still going strong [[Recap/StarTrekVoyagerS3E8FuturesEnd when the decade actually came around]]. One of the novels makes a truly heroic effort to fit it into real history, explaining how the wars could have happened with no one knowing about them.
** In contrast, the ''Star Trek: Khan'' comic miniseries dispels all pretense and pushes it straight into AlternateHistory, depicting Khan and his followers nuking Washington DC and Moscow... IN 1992!
* {{Ubermensch}}: Khan and his followers are physically and mentally superior to ordinary humans.
* VirtueIsWeakness: When Marla [=McGivers=] asks to be excused from seeing her captain and the other officers executed, Khan comments "I had hoped you would be stronger."
* WouldHitAGirl: Khan ''and'' his underlings.
* WrestlerInAllOfUs: Kirk uses several wrestling moves against Khan in their climactic fight. A piece of FridgeBrilliance; Khan is superhumanly strong and tough and is able to NoSell direct strikes, but he still only weighs as much as a normal human and can still be grappled and thrown.