The ''Enterprise'' comes across the science vessel SS ''Tsiolkovsky'' (which looks peculiarly like the USS ''Grissom'' from ''Film/StarTrekIIITheSearchForSpock''--apparently, TheFederation doesn't update their designs much) to find the entire crew dead. It turns out they were all acting crazy and died when someone blew the hatch. The bodies all look like the ones from the [=TOS=] episode "[[Recap/StarTrekS1E4TheNakedTime The Naked Time]]"; Geordi finds the body of a woman who was taking a shower with her clothes on, causing him to start sweating and acting strange. Can you see where this is going? Riker does and enlists Data to look through their library to find out where he's heard about something like this before. When even the characters notice the episode is a rip-off, you know you're in trouble.

Dr. Crusher decides that Geordi should be confined due to his strange behavior. Naturally, Geordi is left unsupervised and unconfined, and he wanders off. Meanwhile, Wesley has decided to take recordings of Picard and [[TwistingTheWords Twist the Words]] to make it sound like he's putting Wesley in command. Geordi, of course, doesn't see any problem with this and compliments Wesley on his ingenuity. Data finds the relevant information after much difficulty (apparently Google didn't survive to the twenty-fourth century) and then the episode ends. No, of course not--this is a mutation immune to [=McCoy's=] antidote. Instead, Yar gets infected from Geordi and Troi from her. Yar becomes hot for Data and improbably infects him. Troi throws herself at Riker, who takes her to Sickbay and infects Crusher. Crusher now wants to get it on with Picard. Interesting how the infection causes the women to get horny, but not the men.

Wesley has also been infected from Geordi and inevitably the first thing he does after losing his senses is hijack the ship, using ([[ChekhovsGun you guessed it]]) that recording of Picard which was [[SarcasmMode totally innocent fun]]. To make matters worse, the star whose collapse the ''Tsiolkovsky'' was supposed to be examining is starting to... well, collapse. Picard is forced to ask Captain Wesley to save the day and Wesley cheerfully decides to follow through. Wesley realizes Data can put back the command chips removed by the infected assistant chief engineer at super speed. This still doesn't give them enough time, so Wesley throws the ''Tsiolkovsky'' into the way of the core fragment with the tractor beam. By this time, the elder Crusher has developed a modified vaccine and the day has been saved.

Sadly, unlike many of the finer episodes of the show, our description is better than the work itself. Trust us on this one!

* BareYourMidriff: Tasha Yar. Wow.
* CanonDiscontinuity: When the crew research the previous incident with the original ''Enterprise'', the computer shows a diagram of the movie refit version rather than the TV version. This was apparently deliberate, with the production team not wanting to acknowledge the now-dated look of the original TV series and always using movie-style aesthetics to mean "old ships." This policy changed later on in [[Recap/StarTrekTheNextGenerationS6E4Relics "Relics"]] when we finally get to see the original ''Enterprise'' bridge again, and in the Blu-ray release, which changed the diagram to the TV version.
* ChekhovsGun: Wesley shows Geordi his voice recorder early on; he later uses it to take control of Engineering. In addition, the handheld TractorBeam that he plays with and turns into a repulsor beam inspires him to do something similar with the full-scale one on the ''Enterprise''.
** While surely not the intent of the writers at the time, Data getting intimate with Tasha Yar ends up becoming a ChekhovsGun, which fired in season 2's ''[[Recap/StarTrekTheNextGenerationS2E9TheMeasureOfAMan The Measure of a Man]]''.
* CompositeCharacter: Wesley fills the roles of both Lt. Riley and Scotty from the original "[[Recap/StarTrekS1E4TheNakedTime The Naked Time]]".
* CrossReferencedTitles: With the Original Series episode "[[Recap/StarTrekS1E4TheNakedTime The Naked Time]]".
* CurseCutShort:
--> '''Data:''' And there was a rather peculiar limerick being delivered by someone in the shuttlecraft bay. I'm not sure I understand it. "There was a young lady from Venus, whose body was shaped like a--"\\
'''Picard:''' Captain to security! Come in!
* EarlyInstallmentWeirdness:
** Data gets drunk (and he's still using contractions), Kirk and the ''Enterprise'' are treated as being obscure, and many more.
** Troi refers to Riker as "Bill."
** Data's explanation of how the virus can affect him is the clearest artifact of the original conception that he was actually more of a cyborg with several organic components.
** Sarah [=MacDougal=] is the first of several chief engineers on the ''Enterprise'', before Geordi is promoted to that position in Season 2.
* EverybodyHasLotsOfSex: Zig-zagged with the main cast apart from Tasha, but [[FunnyBackgroundEvent judging by what we see the background extras doing in corridor shots]], there seems to be a ''lot'' of it going on...
* {{Fanservice}}: Tasha Yar and her [[ outfit.]]
* ForegoneConclusion: When our heroes find what looks like the solution to their problem before the episode is half-over, you can pretty much guarantee that it won't work.
* FunnyBackgroundEvent: As the infection spreads, more and more of the ''Enterprise'' crew leave off their duties and start hanging all over each other in the corridors.
* GrammarNazi: Data pointing out to Riker that the correct term is to be "[[ThrownOutTheAirlock blown out]]" into space.
* TheGreatPoliticsMessUp: The SS ''Tsiolkovsky'''s dedication plaque says it was manufactured in the USSR. Oops.
* IdiotBall: When Wesley barricades himself in Main Engineering, using his portable tractor beam to forcefield the door, the Chief Engineer has to go through a complicated process to cut power to his device. No one thinks to just grab a phaser and melt the unprotected glass.
* KissingUnderTheInfluence: Data and Tasha Yar having sex together while intoxicated. After they were cured, Tasha tells Data that the whole thing never happened.
* LampshadeHanging: The crew finds computer records that point out that this is exactly what happened in ''[[Recap/StarTrekS1E4TheNakedTime The Naked Time]]''.
* LegendaryInTheSequel: Averted--when the crew looks up the original ''Enterprise'', none of them seem particularly familiar with the ship or James Kirk. This is in contrast to ''Series/StarTrekDeepSpaceNine'' and ''Series/StarTrekVoyager'', both of which play this trope straight with Kirk being famous and much admired. Note that Bones gave the show a send-off an entire episode ago.
* LetUsNeverSpeakOfThisAgain: Invoked by Tasha about her liaison with Data. Considering that Tasha is later revealed to have grown up on a hellish colony, constantly dodging rape-gangs, there might be a very ''good'' reason that she doesn't want to be reminded of the polywater intoxication turning her into the ship's bicycle. This incident might have brought up some very painful memories that she'd rather just forget about.
* LoveableSexManiac:
** ''Every'' female character is turned into one. Some fans have naturally taken issue with how this was apparently the only thing the writers could come up with to show any of them acting weird.
** Also a matter of TruthInTelevision. Alcohol intoxication reduces testosterone production in men, leading to an eventual inability to perform. In women, however, it actually increases testosterone production, which in turn ramps up their sex drives. The combination of reduced inhibitions and an increased sex drive is the source of the idea that women become looser when they're drunk.
* LoveIsInTheAir: The intoxication-infection spreads only by direct contact, but at the same time, induces its victims to touch others. It takes over the ''Enterprise'' in short order.
* NegativeSpaceWedgie: The collapsing sun.
* NotHimself: Just about everybody by the end of the episode -- Worf is the only main character not to be affected at all, Riker doesn't start showing any symptoms until right before he's cured anyway, and Dr. Crusher is eventually able to shrug off the effects of the virus -- though it's been noted how odd it is to have this kind of story as just the second episode. We've just barely gotten to know these characters, so how is their acting out of character supposed to be any fun?
* ReadyForLovemaking: Tasha Yar
* RealLifeWritesThePlot: A Writers Strike caused the need to recycle the Original Series episode. Why they decide to recycle this ''specific'' episode is still a mystery (there were plenty of options that didn't rely on discredited scientific concepts or the characters you know acting odd, after all).
* {{Retcon}}: The ''Enterprise'' looking like the movie version has already been mentioned, but the episode also changed polywater from "The Naked Time's" form of water (as the then-cutting edge scientific concept of polywater said it was) to a kind of virus which for unexplained reasons is called polywater (as polywater had turned out to not actually be possible in the early '70s).
* {{Robosexual}}: Data is fully functional in every way of course, and gets to prove it at Tasha's very strong insistence.
* ScottyTime: Continuing a fine Trek tradition, only this time, it's the ''chief engineer'' who says it will take hours to put all the control chips back in, only to be upstaged by Wesley who suggests having Data sort them. She also says it would take weeks to convert the tractor beam into a repulsor, and once again, Wesley is able to do it in a few minutes.
* SexyBacklessOutfit: Tasha Yar, again.
* ShoutOut: Among the tools Riker asks for when trying to break into engineering is [[Series/DoctorWho a Sonic Driver]].
* ThrownOutTheAirlock: The bridge crew of the ''Tsiolkovsky'' did this to themselves.
* TooDumbToLive: Both the chief engineer and assistant chief are called away, and ''Wesley'' is left in charge over the several qualified engineers in the room. By the way, this is ''before'' the assistant chief is infected with the virus.
* {{Underboobs}}: Tasha Yar, ''again.''
* {{Vaporwear}}: Tasha Yar. That outfit has the least amount of cloth possible to make a wrap out of; it's clear there's nothing under it. Fully justified, as it's something she threw on between partners in a marathon sex session.