Episode: Season 1, Episode 1
Title: The Man Trap
Previous: The Cage
Next: Charlie X
- Bizarre Alien Biology: Spock, obviously. Since Vulcan's oceans do not contain the same types of salts that Earth's oceans do, the Salt Vampire found him very unappetizing.
- Bluff The Imposter: Spock was starting to get suspicious of Vampire!McCoy, and was attacked just before he was about to confront her.
- Book Ends: Sulu and Rand share a rare extended scene together in this episode. So rare, that the only other time they have one is in the sixth and last movie.
- Bullying a Dragon: Spock slapping the Salt Vampire numerous times counts as this. The only thing that saves it from being Too Dumb to Live is that Spock was trying to prove that the Salt Vampire wasn't Nancy in order to get McCoy to shoot her.
- Doppelgänger Replacement Love Interest: Dr Crater's wife Nancy actually died a year or two ago, and the alien has taken her form and lives with him.
- Early Installment Weirdness: Spock being so open in his fear for Kirk could count as this.
- Spock has numerous emotional outbursts in this episode which is radically different to his cold, logical personality later in the series.
- Embarrassing Nickname / Affectionate Nickname: Apparently McCoy's was "Plum" when he was with Nancy.
- Evil Detecting Plant: Beauregard/Gertrude freaks out when the creature gets near.
- Geeky Turn-On: Uhura loves a man who can speak Swahili!
- Though considering that Uhura is supposed to be from Africa, Swahili would not appear to be that obscure from her perspective, and might even be her mother language. In this case it would mean that she is more intrigued by the fact that this man is familiar with her own culture.
- Girl of the Week: And for once, the girl is McCoy’s. And she’s been killed by an alien. Typical.
- Go Through Me: An inversion: Spock positions himself directly between the salt vampire and Kirk.
- Green Aesop: The episode sounds like it was written to talk about extinction of species. Since this alien happened to be a blood (okay, salt) thirsty alien who was well on their way to mass murder, it was a somewhat Broken Aesop.
Prof. Crater: It's the last one. The buffalo. There is no difference.
- The broken nature of the Aesop is actually Lampshaded:
Kirk: There's one, Professor. Your creature is killing my people!
- Last of His Kind: The alien.
- Let's Split Up, Gang: Every victim of the salt monster was singled out after the party split up for some reason, with the exception of Crater, who was with Spock (who was taken by surprise and overpowered first).
- Morally Ambiguous Doctorate: Dr. Crater is more concerned with protecting the creature than with the fact that the creature is killing people. When Kirk and Spock go to confront him over what he knows, he pulls out a laser pistol and starts shooting at them.
- Nonindicative Name: The Salt Vampire wasn't picky about gender and would've preyed on a woman as easily as a man. If by "Man" the concept of "human" was meant, the Salt Vampire went after Spock, only to find Vulcans didn't have the right kind of salt.
- OOC Is Serious Business: Ever notice that Spock gets at his most emotional whenever Kirk is in danger?
- Out-of-Character Alert: The Salt Vampire tends to give herself away a bit because of this, especially when posing as Doctor McCoy.
- Punched Across the Room: Spock, by the Salt Vampire.
- Red Shirt: Three crewmember deaths in one episode. None of whom were actually wearing red.
- Shapeshifter Default Form: Though we see the alien’s actual appearance - it looks something like a swamp monster with a fish face and big teeth - it takes this form only when it has been stunned or weakened (and upon its death); it seems to be most comfortable in the form of Nancy, because it is implied that it "feeds" on positive emotions, and both Crater and McCoy are very fond of her.
- Shape Shifter Guilt Trip: McCoy hesitates to shoot the alien because it has taken the form of his old flame.
- Shapeshifting: With a side order of affecting individual's perceptions. When we first meet "Nancy", McCoy sees her as a young woman, Kirk sees the same woman but at middle-age, and the crewman that accompanied them sees a completely different young woman.
- Ship Tease: Uhura flirting with Spock, trying to get him to give her a romantic description of his homeworld. But alas, Vulcan Has No Moon. Doubles as Hilarious in Hindsight thanks to the 2009 film.
- The Worf Effect: The salt vampire smacking Spock against the wall counts as this (at least in hindsight).
- This Was His True Form: The alien reverts to its true form after it dies.
- Truth Serum: Apparently this exists in the future. It will never be brought up again in any episode. Alternatively, it could very well be little more than "truth serum" as it is today - a drug that makes the user highly susceptible to suggestion. Desperate times call for desperate measures.
- Vulcan Has No Moon: Trope Namer.
- A Wolf in Sheep's Clothing: Once the creature takes Crewman Green's appearance to get aboard the Enterprise.