[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/Tomb_of_the_cybermen_tv.jpg]]
[[caption-width-right:350:Music/DaftPunk, the early years!]]

-> ''Our lives are different to anybody else's. That's the exciting thing. Nobody in the universe can do what we're doing.''
-->-- '''The Doctor'''

The TARDIS lands on the planet Telos, where a group of Earth archaeologists is trying to uncover the fabled Tomb of the Cybermen.
The Doctor helps them get in, where they discover the creepy silent remains of the Cybermen's city.

After one of the expedition's members dies in an accident in the weapon testing chamber, the expedition leader, [[ReasonableAuthorityFigure Professor Parry]], decides that the expedition should return to Earth and be better prepared for the next expedition. Kaftan, one of the expedition's financial supporters, makes her servant Toberman sabotage the rocket so they can't get off the planet and has to explore further.

The Doctor helps them to open the way down to the tombs of the Cybermen, whereupon Kaftan and logician Klieg awaken the Cybermen from their cryogenic sleep and reveal that they are in fact there to revive the Cybermen, using their brains and the Cybermen's strength to conquer the universe.

As bad an idea as this would be, it turns out to be irrelevant anyway, as out the tomb is just a giant logic puzzle designed to weed out everyone but the smartest people, whom the Cybermen judge worthy to be turned into more Cybermen. The Cybermen punch their way out of the refrigerated tombs and attack the party accompanied by little slug-like Cybermats.

Toberman is captured and partially Cybermodified, but the party manages to escape the tomb area and stall off the (still weakened) Cybermen. The Doctor also uses electricity to disable the Cybermats and later the group finds a single Cyber-prototype weapon to keep the Cybermen at bay.
At the same time, the Cybercontroller orders his Cybermen to return to their cryogenic tombs (as they are very low on energy), while Kaftan and Klieg attempt to betray the Doctor and friends by stealing their weapon and using it to seize control over the Cybermen, causing a very uneasy (and temporary) alliance between the Doctor and the Cybercontroller to ensure their mutual survival. Kaftan and Klieg end up being massacred by a lone Cyberman and with the mutual threat gone, the Cybercontroller turns against the Doctor's group, but Toberman's will power allows him to temporarly overcome his Cyberconditioning and destroys one Cyberman, giving everyone the chance to escape. Finally, Toberman makes an HeroicSacrifice by closing the entrance to the tomb and activating the door's defense mechanism, which electrocutes both him and the Cybercontroller, leaving the remaining Cybermen locked inside forever.
The Doctor, Jamie and Victoria part ways with the surviving expedition's members and each go on their way.

----

The story was thought to be lost for decades, until a complete copy was discovered in Hong Kong -- Prior to October 2013, it was the only complete story of Season 5, of Victoria, and of the first two years of Troughton.

Also, this episode turned Creator/MattSmith (i.e. The Eleventh Doctor) into a fan of the show.

!!Tropes
* AllThereInTheManual: Toberman was intended to be deaf, but during filming they managed to remove every reference to this. This ended up with some {{Unfortunate Implications}} in the portrayal of the story's one black character. The references did make it into the novelization.
* BatmanGambit: The Cybermen's plan counts on someone eventually being smart, curious, and determined enough to get to them.
* BigBad: The domed Cyber Controller. As Cyber Leaders hadn't been invented yet, this was the first time we saw a chain of command with the Cybermen.
* TheCavalry: Captain Hopper distracts the Cybermen with some smoke bombs, allowing The Doctor, Jamie and Professor Parry to get away just in time.
* CreepyMonotone: The Cybermen.
* DeadpanSnarker: Victoria.
* TheEndOrIsIt: When Jamie asks the Doctor if this is the end of the Cybermen the Doctor says he never likes to make predictions. As they leave a Cybermat is shown moving towards of Toberman.
* EvilIsNotAToy: Klieg never learns this. Well, technically he does, but it's a rather fatal lesson...
* FoodPills: And suddenly Victoria is not hungry.
* HandBlast: Several Cybermen fire electrical bolts from their hands.
* HeelFaceTurn: Toberman.
* HeroicSacrifice[=/=]YouShallNotPass: "They will not get past Toberman."
* HollywoodDarkness: The tomb interior is remarkably well-lit considering it's all underground with no visible light sources. Lampshaded, with Jamie remarking on it and receiving a technobabble explanation about the walls being designed to be phosphorescent.
* ItsQuietTooQuiet: After Hooper and Callum manage to re-open the entrance to the undertomb, they listen for any sound from the party that was trapped down there. Victoria remarks that it's very quiet, and Hooper says it's too quiet.
* JustForPun: See LamePunReaction below.
* KarmicDeath: Kaftan and Klieg are killed by the Cybermen - the very creatures they wanted to bargain with.
* LamePunReaction: Jamie does not appreciate the Doctor's attempts at wit.
-->'''Doctor''': The power cable generated an electrical field and confused their tiny metal minds. You might almost say they've had a complete metal breakdown! ''[Jamie groans]'' I'm so sorry, Jamie.
* LockingMacGyverInTheStoreCupboard: Well, more like Locking Both Traitors In The Weapons Testing Room, which is even dumber.
* LogicalFallacies: Victoria reaches the (correct) conclusion that the Doctor is older than he looks based on nothing more than the fact that he's a time traveller.
* LookBehindYou: Twice when Kaftan is holding Victoria at gunpoint, Victoria has a panicked reaction to a cybermat sneaking up behind her. The first time there really is a cybermat, but Kaftan thinks it's just a trick until the cybermat attacks her. The second time it's just a bluff, and it works.
* MissingEpisode: The story was lost for decades until 1991, when a copy of all four episodes was returned from Hong Kong of all places, along with a number of other British TV programs.
* OnlySmartPeopleMayPass: The controls to the tomb are a giant symbolic logic puzzle. Justified, in that the Cybermen want their new race to be built from only the best - that is, people smart enough to figure out the puzzle.
* PlayingPossum: First Kaftan fakes being unconscious (though not dead), and later on the Cybercontroller plays possum.
* ScaryBlackMan: [[FairForItsDay Toberman]], with a surprising dose of HiddenDepths.
* SealedEvilInACan
* SequelHook: From the ending shots, it's quite obvious that this is ''not'' the end of the Cybermen.
** This could be a contrast to the previous story's ''final end'' of the Daleks. The Producers wanted to get rid of the Daleks and use other monsters, so they show the Cybermen are still around.
* SmugSnake: Neither Kaftan nor Klieg are nearly as clever as they think they are, but Klieg in particular spends a lot of time strutting around inadvertently letting the Doctor make him look stupid. They also keep telling themselves they'll be able to control the Cybermen right up until they are deleted.
* StrawVulcan: The Logicians.
* TakeOverTheWorld: Kaftan and Klieg plan to use the Cybermen technology to do this.
* TooDumbToLive: Klieg. Most of the others too, seeing as they always leave guns lying around for someone to grab them.
* VillainousBreakdown: Klieg just can't seem to grasp that the Cybermen never will cooperate and that his plan was doomed to fail from the start. At the end, he names himself the new Cybercontroller, right before he is killed by a Cyberman.
* WomenAreWiser: Of a sort; each logician is as bad as the other, but of the two Kaftan clearly has her head screwed on a bit better than Klieg.
* TheXOfY
* YouWillBeAssimilated: [[CreepyMonotone "You beeelong to Uzzz. You shall beee like Uzzz."]]
* YoureInsane: Towards the end, the Doctor [[Awesome/DoctorWho rather awesomely]] humours Klieg's delusions of grandeur, purely for the purpose of getting Klieg wound up and ranting like a megalomaniac so that he can use this as a put-down.
-->'''The Doctor:''' Well, now I ''know'' you're mad. I just wanted to make sure.