Original air date: September 20, 1968
In 1968, NBC wanted to cancel Star Trek after two seasons, but the cult fanbase organized a letter-writing campaign to save the show for a third season. They succeeded and Trek's third season began with an episode no one would forget.
It all begins when the Enterprise encounters an alien spacecraft. Scotty is amazed that they are so advanced as to use ion propulsion, a technology which existed at the time the episode was written (however, as it's clearly an FTL drive, it's the same as today's In Name Only). The spacecraft's only occupant beams onto the bridge of the Enterprise and it turns out to be yet another alien woman who wears Stripperiffic clothes. The men (and Uhura, for some reason) stare as the soundtrack swells with romantic music, as they've clearly never seen a woman like this before. As we will learn later on, she is named Kara (Marj Dusay). But Kara does not come in peace. Using a wrist band, she knocks out everyone on the ship with that "boing" sound effect which Sufficiently Advanced Aliens always use. After seeming momentarily interested in Kirk's butt, she walks up to the unconscious Spock and gleefully strokes his cranium.
After a commercial break, our heroes awaken to find Spock is no longer on the bridge. McCoy calls Kirk down to Sickbay, where we learn Spock's brain has somehow been surgically removed and he is now on life support. DeForest Kelley struggles valiantly to make the silly things he's saying sound believable, but it doesn't help that McCoy contradicts himself twice in the scene. First he says that Spock's Bizarre Alien Biology helped him survive without a brain, but then he says Spock is more dependent on his "tremendous brain" for life support. As opposed to humans, who can, of course, survive perfectly fine without brains. He also claims to have absolutely no idea how long he can keep the brainless Spock alive, but later he declares out of the blue that they have twenty-four hours. Curiously, this appears to be twenty-four hours from the moment McCoy said it rather than from when Kara actually removed the brain. In a Hilarious in Hindsight moment, Kirk says they'll have to bring Spock along "In Search of..." his brain.
Anyway, the Enterprise follows the ion trail left by Kara's ship to the Sigma Draconis systemnote , but they can't determine which of the system's three class M planets she landed on and none of them seem capable of creating something so advanced as FTL starships. Playing on a hunch, Kirk decides to go with the primitive ice planet, which has been giving off regular pulses.
The landing party gets attacked by cavemen and, strangely, the two Red Shirts they brought along don't die. Kirk stuns one of the cavemen and the rest retreat. They question him and he tells them about "the others", who "give pain and delight". He speaks perfect English, however, he doesn't seem to understand words like "women" or "female", or indeed the concept of a mate. No one thinks to ask where the babies come from instead. Meanwhile, Chekov detects evidence of a buried city and Kirk leads the landing party there, presuming it's where the others live. They find a cave which they conclude is a trap that the others have set for the cavemen. Kirk orders McCoy to beam down and he brings with him a remote-controlled Spock. Yes, Spock's brainless body is now controlled by McCoy with a Handy Remote Control which has all of ten buttons on it. And for some reason, Spock is now sporting the Omicron Ceti III colony outfit he wore back in "This Side Of Paradise". Kirk, McCoy, Scotty, and Spock's body enter the cave to set off the trap. Chekov and the Red Shirts are left to stand guard outside the cave and thus do nothing for the rest of the episode. Who would have guessed that this would be the episode in which two Red Shirts live?
The cave turns into a elevator via a Screen Shake effect and transports our heroes down to an Elaborate Underground Base, which consists of those geometric hallway sets they always use to represent interiors on advanced planets. Waiting for them is another half-naked woman with a wrist band, but Kirk stuns her before she can "boing" them. The soundtrack swells with more romantic music as they interrogate her and she provides inane answers to Kirk's questions. Kirk at first thinks she's Obfuscating Stupidity, but tricorders are apparently Lie Detectors now and Bones says the woman has the mind of a child. This is a bit of an understatement. If you asked most children what this place is, they would come up with something better than "this place is here". Meanwhile, Scotty has managed to pick up Spock's disembodied brain on his communicator and somehow it can talk in Spock's voice without having his vocal cords. Spock's brain tells Kirk that "there is a definite pleasurable experience connected to the hearing of your voice." Les Yay and Ho Yay in the same episode! Who doesn't love Star Trek? Kirk tells Spock's brain that they'll get to it and the disembodied organ quips "A practical idea, Captain. It seems unlikely that I shall be able to get to you."
At this point, Kirk, McCoy, Scotty, and Spock's body are taken prisoner by Kara. They are brought to some kind of conference room with her all-female counsel and their male bodyguards. By now, it has become apparent that the cavemen living on the surface are the "Morg", the women living underground are the "Eymorg", and that the Eymorg enslave the Morg using their wrist bands. How either society can procreate is not explained. Kirk demands Kara returns Spock's brain, but she not only has no memory of taking it, she doesn't even seem know what the word "brain" means. "Brain and brain! What is 'brain'?!" she asks in exasperation, giving us the the episode's most famous linenote . Kirk asks to speak to their leader. Kara says she is leader, but Scotty and McCoy dismiss this as impossible since they need engineers and doctors and none of the people in that room are smart enough.
They finally get far enough through Kara's beautiful thick skull for her to mention that there is a "Controller". Then Kirk has an epiphany. "Spock's... brain... controls," he says in classic William Shatner fashion. Kara leaves with her counsel to consult the Controller, leaving their Morg slaves to guard the prisoners. In stupidity which is for once justified by the plot, the Eymorg have left Kirk, McCoy, and Scotty in the same room as their communicators and tricorders. They take them back after a Fight Scene with the Morg slaves and contact Spock's brain again. Spock's brain beams them a signal which they follow to the Wetware CPU room. Kara uses her wrist band to hit them all with an Agony Beam. While writhing in pain, Kirk grabs the remote control, using Spock's unaffected body to overpower Kara and free them.
Kara pleads that her people will all die without their new Controller, saying the old one is finished. Since it's obvious they won't die just for having to think for themselves, Kirk refuses to listen and demands to know how she removed Spock's brain. Kara says she used the "old knowledge" from "the Teacher". The Teacher turns out to be a Cool Helmet and Kirk forces it onto the head of a protesting Kara. It turns out making a hostile alien smart isn't such a brilliant move, as she pulls out a phaser which she had apparently been keeping in Hammerspace since that dress certainly doesn't have pockets. Rest assured, this turns out to be a Cliffhanger Copout and Kirk gets back the phaser from her rather easily after a commercial break. Kirk and Kara have an argument in which she actually makes better sense, mostly because Kirk never addresses her concerns about her people and instead just keeps repeating that Spock will die.
McCoy suggests he could use the Teacher, but Spock's brain warns him that it wasn't made for humans and tells him that he can't take that risk. McCoy insists it's worth the risk since he could bring the knowledge he will learn to the world. Kirk lets McCoy do it. It causes him to faint, but it still works and he gasps that "a child could do it!" Naturally, the big mystery of how to remove and restore a brain is going to be resolved with The Unreveal. They even have Bones operate behind a partition so that they don't have to explain what he's doing (and so they don't have to show Leonard Nimoy's sawed-open skull with his nerve endings protruding). Oh, and they're doing this operation while in the underground Eymorg complex. How it still has light, oxygen, etc. without the Controller is not explained. Kara is also still there, acting the Neutral Female. Kirk tells her that they won't die and launches in with his Kirk Summation, telling that they'll be better off living on the surface with the Morg note
Meanwhile, McCoy is forgetting the knowledge he learned from the Teacher, but Kirk has a brainstorm to save the day. He has McCoy connect Spock's speech center and then Spock freakin' directs his own brain surgery. note In any case, the operation is successful, however improbably so. By the way, Spock's brain has now been surgically removed and restored without affecting his trademark hairstyle at all. Spock starts to talk about how fascinating the Scavenger World they've just destroyed is and McCoy snarks that he shouldn't have reconnected Spock's mouth. Cue "Everybody Laughs" Ending.
The Fan Nickname for this episode is "The One With… Spock's Brain". It is the only episode of the series to feature a main character's name in the English title. It is also, far and away, the episode with the most title dropsnote , to the point that many people have made a Drinking Game out of it. It's not recommended for lightweights. It may also be the episode that uses the "BOING!" sound effect the mostnote ; adding that to the drinking game will destroy one's liver.
Trope and trope! What is "trope"?
- Agony Beam: The Others are described as bringers of pain and delight. The first is explained when the priestess-leader activates her Super Wrist-Gadget, sending our heroes into writhing agony thanks to the pain-belts that have been placed on them.
- Artistic License – Physics: In the episode, "ion propulsion" is supposed to be more advanced than anything the Federation has come up with. In reality, an ion thruster uses excited gases to generate a small but long-lasting thrust.
- Brain in a Jar: Spock while he's installed as the Controller, although the jar is opaque so they didn't have to go to the expense of making a brain prop.
- Brain Theft: The plot involves Spock's brain being stolen.
- Brainless Beauty: The Eymorgs.Kara: Brain and brain! What is "brain"?!
- City with No Name: When Kirk asks Luma what the Underground City is, she just answers in confusion, "This place is Here", having no concept of any other place than the one she lives in.
- Cliffhanger Copout: Kara steals a phaser set to "kill" and prepares to shoot Kirk with it. Time for a commercial break...followed by Scotty pretending to faint, distracting Kara so Kirk can take back the phaser. Moving on...
- Dissonant Serenity
- Double EntendreScotty: Pain and delight, he said up above.McCoy: I'm sure you noticed the delight aspect of this place.Kirk: Yes, I certainly did notice those delightful aspects. But that too was strictly under command of the women.
- Dumb Muscle: The troglodytes on the surface are very large and strong, but don't seem any smarter than the vapid women down below.
- "Everybody Laughs" Ending: The humans laugh as Spock rambles on while Kirk makes a futile effort to switch him off with the remote.
- Fake Faint: Kara steals a phaser set to "kill" and prepares to shoot Kirk with it. Scotty pretends to faint, distracting Kara so Kirk can take back the phaser.
- Fanservice: The Eymorg in their thigh-high boots and stripperiffic Space Clothes. And for those in the audience with a dominatrix fetish, they're into "pain and delight" as well.
- Fantastically Challenging Patient: A humanoid alien incapacitates the crew of the Enterprise. Upon recovery, they discover that she has absconded Spock's brain, leaving his body alive but mindless. It becomes the episode's mission to track down the brain thief and recover Spock's brain before his body fails from lack of purpose. Bones is ultimately able to operate on Spock and get his brain back in.
- Genius Serum: There's a Neural Implanting device called "The Teacher." It's a pimped-out crash helmet that can raise the intelligence of a Stripperific bimbo to where she can conduct Organ Theft aboard the Enterprise undetected. The heroes use to this device on Doctor McCoy so that he can reattach Spock's brain to the rest of Spock, but the effect wears off during the surgery.
- Gut Feeling: Kirk is faced with three Class M planets in the Sigma Draconis system, with only time to investigate one of them. Two have inhabited civilizations, but are not advanced enough to build an ion drive spacecraft. The other is a glacial world inhabited by primitives, but with regular pulses of energy coming from it. Kirk takes his chance on the last planet and turns out to be right.
- I've Never Seen Anything Like This Before: Scotty in response to seeing an ion drive vessel and brain-replacement surgery.
- Liberty Over Prosperity: As in "The Apple", Captain Kirk forces a society in stasis to evolve by effectively destroying their Master Computer. At least this time he offers to stay around and help them adapt.
- Lie Detector: McCoy uses his tricorder for this on Luma.Kirk: You're lying!McCoy: She's not, Jim. No change in reading. She doesn't know.
- Lobotomy: Spock's entire brain gets removed.
- Machine Worship: Kara says the Controller will have all their devotion. Kirk tries to invoke this (he even does a Kneel Before Zod) to make Kara take them to the Controller, but even a ditzy Eymorg isn't dumb enough to fall for that.
- Major Injury Underreaction: How does Spock react to the news that he's a disembodied Brain in a Jar? It's fascinating, of course!
- Mars and Venus Gender Contrast: The Underground City was built for the women while the men were expected to work on the icebound surface. Somehow the two societies because estranged, with the men reverting to a primitive state while the women abduct them periodically for slaves and procreation. When Kirk tries to question a Morg, he doesn't even know what a woman is — just "The Others" who "bring pain and delight" for their own mysterious reasons.
- Men Are Strong, Women Are Pretty: An entire society based on this trope!
- The Morlocks: The Eymorg live in luxury beneath the surface and abduct the primitive Morg for procreation, an inversion of the Trope Namer.
- Mother Russia Makes You Strong: Chekhov says that despite its freezing temperatures Sigma Draconis VI is "livable". Kirk quips that Chekhov has a thick skin.
- Motor Mouth: Spock after his brain is restored, much to McCoy's annoyance.
- The Needs of the Many: When its pointed out that Spock will die without his brain, the priestess replies that the needs of her people take priority. Then when McCoy is told it could be fatal to use the Teacher on a human brain, he urges Jim to Just Think of the Potential! if he could retain his medical knowledge.
- Never Give the Captain a Straight Answer: When McCoy calls Kirk down to Sickbay after discovering Spock's condition, he doesn't give him any hint of what's happened, just "You'd better come and see for yourself". Justified as he has No Time to Explain as he has to get Spock's body on life support.
- Neural Implanting: The Teacher is a helmet that implants in the wearer the Knowledge of the Ancients. However the knowledge only lasts a few hours, explaining how Kara was able to pilot an ion drive spacecraft to Enterprise and conduct brain surgery, yet be a Womanchild by the time Kirk encounters her again. McCoy puts on the Teacher and gains the knowledge to replace Spock's brain, but starts to lose the knowledge before he's finished, and Spock has to guide him through the rest of the procedure.
- Nice Job Breaking It, Hero: Our heroes force Kara to use the Teacher, which gives her the knowledge to operate the phaser she then produces.Scotty: That phaser is set to kill.Kara: So it is. That is the knowledge you have brought me.
- Numbered Homeworld: As per Trek standard, although, for some reason, it appears they forgot what number halfway through. Having established that the planet where the crew are searching for Spock's brain is the sixth planet in the Sigma Draconis system, both Kirk and Sulu make log entries referring to it as Sigma Draconis VII.
- Obscured Special Effects: The amazing brain replacement surgery that Dr McCoy is conducting — we can't see it as Spock's cranium is inserted into a huge panel behind which McCoy is working. Saves us from having to see the gore.
- Once Done, Never Forgotten: Bones says he'll never live down the fact that Spock is telling him how to operate on his brain.
- Orchestral Bombing: Fred Steiner's overwrought score plays a big part in making the episode so... "memorable".
- Organ Theft: In this case, a brain!
- Plot-Sensitive Button: Kirk can control Spock's fine motor functions just by twisting a dial, so as to enable a brainless Spock to grab hold of Kara and force her to press the Big Red Button that releases their pain belts.
- Reaction Shot: Spock's remote-controlled body is given several reaction shots at moments when Spock would have had a reaction if he'd been himself; Remote-Control Spock, of course, just looks unsettlingly blank.
- Rule of Symbolism: The aliens who stole Spock's brain turn out to be pretty brainless themselves.
- Shaped Like Itself: When Kirk asks Kara where they are, she answers in a confused tone, "This place is here."
- Stupid Future People: Tens of thousands of years in an automated city where all their needs are catered for has atrophied the intelligence of the Eymorg. The Morg are no better off, regressing to the level of troglodytes.
- Super Wrist-Gadget: It can knock out the entire crew with a single BOING!
- Stock Footage: The first minute of the episode is a collection of recycled bridge shots edited together, taken mostly from "Friday's Child", "Spectre of the Gun", and "The Enterprise Incident".
- Trap Is the Only Option: Kirk figures the food cave is a trap; he lets it take him and his team to the Eymorg city.
- Two of Your Earth Minutes: According to Kara, the knowledge from The Teacher is retained for "three of your hours."
- Violence Really Is the Answer: A Giant Mook is guarding their tricorders and communicators, with another at the door.Kirk: This fellow is keeping us from our property.Scotty: Isn't there a way to correct that situation?Kirk: I certainly think that science might provide an answer.McCoy: It does, Captain.Kirk: Agreed, Doctor. (Cue Fight Scene)
- Voices Are Mental: The Controller speaks in Spock's voice even before his vocal cords are reconnected.
- We Need a Distraction: Scotty pretends a fainting spell to distract Kara, who is holding a phaser on Kirk.
- Wetware CPU: The autonomic brain functions used to maintain the circulation of a body are used to control the life support system of an Underground City.
- Who Even Needs a Brain?:
- Spock's in remarkably good condition for a man with his entire brain removed. Lying unconscious surrounded by life-support equipment in sick bay: okay, maybe. Walking around with just a funny-looking hat keeping him alive and directing his movement: not even future medical science can make that plausible.
- Averted in one other way, however; McCoy says that if a human crewmember had lost their brain he could keep them on total support indefinitely, but with Spock's Vulcan physiology, his body will die after twenty-four hours, in or out of the medical bay.
- Wrong-Name Outburst: Kirk calls for tricorder readings from Spock before remembering that Spock is short one brain and Scotty has the tricorder.