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[[WMG:[[center:[-''[[Series/DoctorWho Doctor Who]]'' [[Recap/DoctorWho recap index]]\\
'''Fifth Doctor Era'''\\
'''Season 21:''' '''1''' | [[Recap/DoctorWhoS21E2TheAwakening 2]] | [[Recap/DoctorWhoS21E3Frontios 3]] | [[Recap/DoctorWhoS21E4ResurrectionOfTheDaleks 4]] | [[Recap/DoctorWhoS21E5PlanetOfFire 5]] | [[Recap/DoctorWhoS21E6TheCavesOfAndrozani 6]] | [[Recap/DoctorWhoS21E7TheTwinDilemma 7]]\\
'''[[Recap/DoctorWhoS20E1ArcOfInfinity <<< Season 20]]''' | '''[[Recap/DoctorWhoS22E1AttackOfTheCybermen Season 22 >>>]]''']]-]]]
!Warriors of the Deep
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/pileofdeath_959.jpg]]
[[caption-width-right:350: Cue [[StockSoundEffects sad trombone]].]]
->Written by Johnny Byrne\\
Directed by Pennant Roberts\\
'''Production code:''' 6L\\
'''Air dates:''' 5 - 13 January 1984\\
'''Number of episodes:''' 4

->''"There should have been another way."''
-->-- '''The Doctor''', and pretty much everyone who worked on this serial

JustForFun/{{The one w|ith}}here Creator/IngridPitt [[FightSceneFailure karate-kicks a pantomime horse.]] Also the one where, let's face it, ''[[MemeticMutation Fifth drowns]]''.
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After [[Recap/DoctorWho20thASTheFiveDoctors having a wonderful time]] in the [[IDontLikeTheSoundOfThatPlace Death Zone]], the Doctor decides that Tegan should see what future Earth will be like. The TARDIS lands in orbit of the planet Earth in the year 2084, where she immediately comes under attack by [[AttackDrone Sentinel Six]], a killsat in charge of utterly destroying everyone without proper identification.

Mild panic ensues, but the Doctor is able to drop the TARDIS off somewhere mildly safer: an undersea military nuclear missile launch base known as Sea Base 4, also currently under threat of nuclear attack. The Cold War has somehow started up again by the year 2084, [[FailedFutureForecast or maybe it's still going]]. The best we get from the Doctor is that "two power blocs" are engaged in a Cold War of sorts, but the entire story remains deliberately vague about it all.

As the Doctor explains this, we get introduced to our RedShirtArmy of the week, unisex eyeshadow and all. The "East" bloc is acting up again, and the brave crew snap into action, as their computers say it's time to prepare the nukes. Well, maybe. As [[TheKirk Commander Vorshak]] [[AsYouKnow explains to his men]], it could be real or it could all be a drill: they won't know until it's time to press that button. As a further failsafe, they also need [[WetwareCPU someone lashed up to the machine itself]] to make sure the nukes can be launched by giving the final authorization. Cue Ensign Maddox, who's actually the inexperienced backup of someone unimportant who died offscreen. Maddox never really thought he'd be needed, as he was just there to observe, so he freaks out a little at the pressure despite Commander Vorshak [[ReasonableAuthorityFigure telling him he's doing a great job]]... and it turns out it was all a drill, anyway.

Meanwhile, old Doctor Who enemies [[Recap/DoctorWhoS7E2DoctorWhoAndTheSilurians the Silurians]] and their sea-cousins [[Recap/DoctorWhoS9E3TheSeaDevils the Sea-Devils]] are waking up from a long rest. They're now also calling themselves "Silurians" and "Sea Devils", despite both those terms having been made up by the Doctor (and despite "Silurian" being technically wrong anyway, as the Doctor had already pointed out years before). One of the Silurians, Icthar, is in charge as one of the remaining survivors from [[Recap/DoctorWhoS7E2DoctorWhoAndTheSilurians the last time]] the Doctor ran into them. However, time has not been kind to Icthar, or the others in his charge, as the Silurians now mumble incoherently with a [[ThirdEye little flashing light]] to tell us who is talking to whom. The Sea Devils, meanwhile, [[EvilSoundsRaspy whisper menacingly]]... while seemingly bobbing about with their heads tilted to one side. (As Creator/JanetFielding says in the commentary, it always looks like they're going "...you wha?") The Silurians and Sea-Devils have plans and these plans involve Sea Base 4.

Ensign Maddox, suffering from a panic attack, goes to the medical bay to lie down for a while. However, Senior Officer Nilson and Doctor Solow are up to no good, deciding to take advantage of Ensign Maddox's [[WetwareCPU special computer brain]] to brainwash him. Because Nilson [[TheMole works for the "East" Bloc!]] Doctor Solow follows along with this... because, [[CloakAndDagger presumably, she's also with the "East" Bloc.]] Maddox is reprogrammed to sabotage the systems of Sea Base 4, but it's unknown if Nilson and Solow are trying to either capture the base or start the third (fourth? fifth?) World War.

Finally involved in the story again, the Doctor and his companions decide to meander around the top secret undersea nuclear missile base for no reason, exploring the area and getting a feel for the future. Since they landed in a storage closet, the Doctor decides that pointing out the barrels of hexachromite gas, [[ChekhovsArmory which is a gas that's lethal to all marine and reptile life]], would be a cool fact of the day for his companions to know. And then they're immediately chased around by guards, because [[GenreBlindness Turlough]] accidentally sets off some alarms. While trying to provide a distraction ''by intentionally triggering the nukes'', the Doctor is shoved into a giant pool of water. [[FantasticRadiationShielding Inside the reactor]] everyone was just running through. Tegan frets about the Doctor for about two seconds, after which Turlough decides "[[MemeticMutation HE'S DROWNED.]]" Tegan and Turlough are then quickly captured by the soldiers of the "West" Bloc, and the ''Series/DoctorWho'' franchise ends in the Doctor's permanent death...

But not for long! Because it turns out the Doctor has survived! (And [[Creator/PeterDavison Davison]] is ''freezing''. The water was supposed to be allowed to "warm up" over a few nights, but the ridiculously reduced schedule left them filming within minutes of filling up the reactor pool.) The Doctor [[BizarreAlienBiology somehow]] survives the intense radiation and [[SexySoakedShirt swims (dressed)]] his way out of the reactor, taking the time to [[MuggedForDisguise borrow another guard's outfit]]. [[ToiletHumor And then make a fart joke]]. But not before deciding to overload Sea Base 4's reactor to "[[DesignatedHero give them something to do]]".

The base crew is less than amused; also, Maddox seemingly going berserk and dying after taking out several important missile-launching computers doesn't help matters. But the Silurians attacking Sea Base 4 en masse really pushes the base into panic mode. The Doctor charges onto the bridge of Sea Base 4, [[OhCrap and promptly realizes what's about to happen]]. He [[{{Infodump}} quickly explains]] to the crew of Sea Base 4 who's about to attack them all, and that they need to get ready for the worst: a Silurian weapon called [[PantomimeAnimal The Myrka]]. The large, lumbering beast rips through Airlock-1 like it was badly supported plastic. This bio-engineered weapon is so fearsome that humans run up to be embraced by its [[{{Narm}} deadly hugs]] and random spurts of electricity. Meanwhile, a contingent of Sea Devils, resplendent in their {{Samurai}} armour, begin shooting circles of light at soldiers from Airlock-5. The Doctor is able to [[BlindedByTheLight destroy the Myrka]] with a bright blast of UV Light, but not before it [[WimpFight kills Doctor Solow]] [[SarcasmMode in a remarkable display of hand-to-hand prowess]] [[SuspiciouslySpecificDenial that was never ever rolled out before the public as a valid reason to kill off the show]].

It doesn't take long for the Silurians to take over Sea Base 4, and they begin repairing all the damage done by the saboteurs, so they can launch the missiles themselves and begin WorldWarWhatever. [[FridgeLogic Don't bother asking why they didn't just sit and wait for mankind to do the job for them]], otherwise we wouldn't have a story. The Doctor does his best to argue that everyone should just get along, but Icthar will have none of it. After all, some jerk ''also'' named the Doctor promised that [[Recap/DoctorWhoS7E2DoctorWhoAndTheSilurians last time]], and his people [[OhCrap all wound up dead]]. Also, it's time to launch the missiles, destroy the Humans, and generally rule the world.

The Doctor escapes from the bridge along with a few of the humans and stumbles across [[ChekhovsArmory the hexachromite gas]] mentioned earlier. Quickly running out of time, the Doctor realises that he'll have to use the hexachromite gas to flood Sea Base 4 and kill off every Silurian and Sea Devil. He goes into a bit of an existential crisis at having to kill so many people to save even more people, and commands Tegan and Turlough to tend to the gruesomely melting Silurians, while he tries a second option. He hooks up his brain to the WetwareCPU -- which leaves him nearly catatonic with pain, his skin fried, his mind invaded [[MindRape in the worst possible way]], and with everyone around him (except Team TARDIS) dead anyway because they just couldn't stop killing each other.

But hey, [[DownerEnding no World War]].
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This serial was a nightmare behind the scenes. As production was starting up, then-Prime Minister UsefulNotes/MargaretThatcher announced a Parliamentary election, which resulted in the production for this serial losing two weeks to election coverage. Rather than cancel the serial and funnel the leftover money into the other productions that season, it was decided to push ahead anyhow. The green paint on [[PantomimeAnimal The Myrka]] literally didn't have time to dry before its scenes were filmed, and one shot is from a technical rehearsal because there was no alternative footage available. The base was intended to be a dark and gloomy place, which might have helped mask some of the cheapness, but the lighting director refused to light the set that way, either out of technical concerns that the resulting footage wouldn't be usable, or because he had only previously lit Game Shows, depending on who you're inclined to believe; either way, everything being brightly-lit certainly didn't help matters.

"Warriors of the Deep" is also noted for being the last appearance of the Fifth Doctor's "first" outfit. The Doctor [[ChangedMyJumper changes pants into something more creamy-pink and adds a stripe to his sweater]] for the next serial.
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!!This story contains examples of the following tropes:

* ActionGirl: The story tries to set up Preston and Solow as examples of this. Unfortunately, Preston never really gets the chance to do much of anything, and the less said about Solow's big action scene with the Myrka, the better.
* AirVentPassageway: Turlough and some [[RedShirt humans of the week]] go spelunking through some to escape some Sea-Devils.
* AttackDrone: Space satellite Sentinel Six
* AttackItsWeakPoint: Averted, none of the soldiers try shooting the Sea Devils in their exposed face. They just continue blasting away at their blaster proof armour.
* AwLookTheyReallyDoLoveEachOther: Downplayed, but Tegan and Turlough are much more caring toward one another than they have ever been [[VitriolicBestBuds in the past]]. Turlough breaks in front of the armed, hostile guards when Tegan is dragged into the room to check that she is all right, and they have another tender moment when they are reunited after Tegan has been told Turlough is dead.
* BigBadEnsemble: Icthar and Nilson.
* BlindedByTheLight: The Myrka is killed by an intense ray of ultraviolet light aimed at its eyes.
* BorrowedCatchphrase: The Fifth Doctor says "When I say run, run. RUN!", which was a catchphrase of the Second Doctor.
* ChekhovsArmoury: A rather obvious one in the hexachromite gas, which is lethal to marine and reptile life.
* CostumeEvolution: While the only change to the Sea Devils is swapping out their rags for samurai armor, the Silurans feature a more streamlined head design that more explicitly emphasizes their reptilian nature.
* DeadlyGas: Just not, in this case, deadly to mammals.
** In a real-life version, the two actors in the Myrka costume were breathing in fumes from the wet paint on the costume pretty much the whole time they were in it.
* DividedWeFall: The spies for the other human bloc use the alien attack to cover up their own activities.
* DownerEnding: The story concludes with every single character other than the TARDIS crew dead. The Doctor, Tegan and Turlough are horrified, and the serial ends with the line "There should have been another way."
* TheDragon: Sauvix, the captain of the Sea Devil taskforce Elite Group One.
* EternalRecurrence: Humanity has once again divided into two power blocs with the means to destroy the world.
* EverybodyDiesEnding: The surviving characters, even including the regulars, can be counted on one hand.
* EverythingsBetterWithSamurai: The Sea Devil taskforce Elite Group One armour were similar to samurai (especially the helmet.)
* ExtyYearsFromPublication: The story is set a hundred years in the future.
* FailedFutureForecast: Averted since we're never explicitly told much of anything about either of the power blocs, just that there's two of them, which was a deliberate decision to avoid dating the politics.
** The novelization by Creator/TerranceDicks simply refers to the blocs as "West Bloc" and "East Bloc".
* FinalSolution: The Silurians decide the best course of action is to wipe out humanity entirely, by triggering the war Sea Base 4 was designed to fight. The Silurian commander Ichtar even outright refers to it as a "final solution."
-->'''Icthar:''' The humans shall die as they have lived: In a sea of their own blood.
* HumansAreTheRealMonsters:
--> '''The Doctor:''' I sometimes wonder why I like the people of this miserable planet so much.
** Although it veers into BrokenAesop territory in that it's the Silurians and the Sea Devils who are provoking all the aggression, and the humans are pretty much just trying to defend themselves.
** Veers into IAmAMonster territory when the Doctor looks over his best efforts to stop the fighting.
* IDidWhatIHadToDo: But "there should have been another way."
* KillTheCutie: The death of Karina.
* MuggedForDisguise: The Doctor knocks out an unwitting guard before taking his outfit to better hide in plain sight. [[PaperThinDisguise And then discards the plastic helmet that all the others wear.]]
* MyGodWhatHaveIDone: The Doctor's summation at the end:
-->"There should have been another way".
* NiceJobBreakingItHero: One of the many times in Creator/PeterDavison's run where [[TakeAThirdOption the Third option]] really didn't pan out well.
* NoOneGetsLeftBehind: The Doctor invokes this when Tegan gets trapped below a bulkhead, in the path of the oncoming Myrka.
* PantomimeAnimal: The Myrka is played by two dudes (actually the same guys as in ''Series/{{Rentaghost}}'') in an unfinished costume wet with paint. It... doesn't get pulled off well.
* PlotArchaeology: The story sees the return of two classic monsters from the Third Doctor era, the Silurians and the Sea Devils, who appeared in 1970 and 1972, respectively.
* PlotArmor: The Sea Devils walk through the station simply killing everyone they encounter methodically -- ''except,'' of course, the Doctor or his companions, whom the Devils inexplicably take prisoner instead.
** Crosses into BondVillainStupidity[=/=]WhyDontYouJustShootHim territory when Sauvix corners the Doctor and instead of, say, pulling the trigger on his disruptor, he radios Icthar who annoyingly responds "You ''have'' your orders. Kill him!''. This gives Preston time to go for her gun, and while Sauvix does fatally shoot her, it gives the Doctor's companions time to do him in with the hexachromite gas.
* ReasonableAuthorityFigure: Commander Vorshak.
* RedScare: Pretty much in tradition with the two previous stories, really.
* RedShirt: Subverted, the only member of the supporting cast to survive, Bulic, wears a red shirt throughout.
* ReptilesAreAbhorrent: The Doctor tries to convince the Sea Base crew otherwise. Problem is, this line of reasoning doesn't work when said reptiles are killing everyone.
* RippedFromTheHeadlines: The story was written as an allegory for the UsefulNotes/ColdWar, which was at the height of its second hot period at the time.
* {{Samurai}}: The Sea Devils' armour invokes this image.
* SecretlyDying: Vorshak mans the sync console while the Doctor stands in as sync operator, all while the Doctor manages to stop the launch. Vorshak then celebrates, walks across the bridge to a panel... and then collapses dead, as he's been shot (in the front, despite standing facing away from the Silurians), presumably anywhere from a minute to two minutes before. This despite the fact that everyone else shot by the Silurian weapons -- ''including'' the Silurians -- died instantly from them.
* SequelEpisode: To "[[Recap/DoctorWhoS7E2DoctorWhoAndTheSilurians The Silurians]]" and "[[Recap/DoctorWhoS9E3TheSeaDevils The Sea Devils]]".
* SelfServingMemory: Icthar tries to justify wiping out humanity by claiming that between them the Silurians and Sea Devils twice tried to forge alliances with the human race, but were "treacherously attacked" on both occasions. In actuality, only the lead Silurian in their debut story favoured trying to set up an alliance and was quickly killed by his subordinates when they refused to go along with the plan. Icthar's statement is a ''little'' more accurate to what happened in the Sea Devils' first appearance, though leaves out the fact that the Doctor was never able to communicate the offer of peace before the humans launched their attack, and the Sea Devils refused an offer of mediation afterwards. (The ExpandedUniverse adds a ''third'' event which is closer to Icthar's claim: the ''Literature/DoctorWhoMissingAdventures'' novel ''The Scales of Injustice''.)
* SexySoakedShirt: Creator/PeterDavison swims! Dressed.
* StyrofoamRocks: Styrofoam Bulkhead. To the point where it is openly flexing and rippling when touched.
* TakeAThirdOption: The Doctor ''tries'' this but fails.
* ThirdEye: Only this time, the Silurians don't use it as a weapon.
* ThisIsNotADrill: The computer only tells the people on the base whether or not a missile run is a drill ''after'' they've gone through all the motions that will launch their weapons of mass destruction if it is not.
* TooDumbToLive: Solow encounters the dangerous Myrka. Instead of trying to escape and come up with a clever way to defeat it, or just run away, she tries to fight it with her martial art skills. It goes about as well as you'd expect.
* {{Ultraterrestrials}}: Both the Silurians and Sea Devils, as seen in previous serials.
* VisibleBoomMic: A microphone boom can be seen on the left side of the screen in the hallway scene prior to Turlough being rescued by the Doctor in part two.
* UnderwaterBase: The serial's setting is a futuristic example.
* [[WhatASenselessWasteOfHumanLife What A Senseless Waste Of Human And Earth Reptile Life]]: The final line.
-->'''Turlough:''' They're all dead.\\
'''The Doctor:''' There should have been another way.
* WhatMeasureIsANonHuman: The Doctor gets upset at the humans killing Silurians and Sea Devils, even though the reptiles attacked first. Every story with Silurians tries to avert this.
* WimpFight:
** When the Myrka attacks one of the characters, she crosses her arms, twists to the side and performs some kind of half-hearted kick to the creature. It responds by trying to hug her to death. It was this footage, amongst others, that was later to be presented by BBC executives who wanted to axe ''Doctor Who''.
** There's an interesting sequence where the Doctor defeats a whole platoon of guards in hand-to-hand combat while constantly making it look like he has no idea how to fight. Why the Doctor is projecting ObfuscatingStupidity while being in the process of kicking arse is unclear.
* TheXOfY: One of many to use this naming scheme in ''Series/DoctorWho''.
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