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->'''The Doctor:''' When I was on the river, I heard a strange babble of inhuman voices. Didn't you, Romana?\\
'''Romana:''' Yes.\\
'''Professor Chronotis:''' Oh, undergraduates talking to each other, I expect. I've tried to have it banned.

The one screwed over by a WritersStrike.

Filming on "Shada" ("SHAH-duh"), which was interrupted by the 1979 BBC strike, was never completed. It remains the only story of Classic Who that got to the filming stage of production without having been aired on television. But Creator/DouglasAdams scripts aren't so common that they can be discarded so easily, and eventually ''four'' official versions saw the light of day.

The first was the incomplete filmed version. Clips from this episode were initially re-used in "[[Recap/DoctorWho20thASTheFiveDoctors The Five Doctors]]", which saw the Doctor and Romana time-scooped out of the "Shada" plot altogether. In 1992, a full episode was finally cobbled together out of the existing bits, with linking narration provided by Creator/TomBaker -- appearing as a curator ([[{{Recap/DoctorWho50thASTheDayOfTheDoctor}} ho ho]]) in a museum full of old ''Series/DoctorWho'' things, and telling the story in first person.

A Creator/BigFinish-produced audio (also available for free with some [[http://www.bbc.co.uk/doctorwho/classic/webcasts/shada web-animation]]) was recorded from the full script in 2003. It stars the Eighth Doctor Creator/{{Paul McGann}} as the story's Doctor, and Romana during her time as President of Gallifrey, as per AudioPlay/BigFinishDoctorWho canon. In this version of events, the two decide to investigate what should have happened when they were [[Recap/DoctorWho20thASTheFiveDoctors time-scooped]] out of their previous attempt to have this adventure.

A 2012 [[Literature/DoctorWhoNovelisations novelisation]] was written by Gareth Roberts, based on the final versions of the scripts.

Finally in 2017, it was announced that BBC had commissioned the serial to be completed using animation to create the scenes that were left unfilmed and it would be released on home video for the holiday season.

Dougles Adams ended up recycling entire chunks of the plot, as well as the character of Professor Chronotis, into ''Literature/DirkGentlysHolisticDetectiveAgency''.

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One day, the Doctor gets an invitation from Professor Chronotis, a retired Time Lord posing as an eccentric old Cambridge don. He and Romana drop by St. Cedd's College, Cambridge, in 1979.

Chronotis is extremely old, even for a Time Lord, which makes his memory spotty and unreliable... but after some gentle prompting, he eventually remembers that he'd wanted the Doctor to take a certain book back to Gallifrey. No ''ordinary'' book, this, but an ancient relic from the days of Rassilon, the founder of Time Lord society, and possibly (read: almost certainly) full of uncertain and dangerous powers. The three Time Lords begin to search Chronotis' flat for it.

Unfortunately, Chronotis has already forgotten that he'd just that morning lent it out to physics student Chris Parsons -- who's taken his new toy over to the lab to examine it, with baffled fascination, and even asked his girlfriend Clare to come have a look.

Even ''more'' unfortunately, someone else is after the book, too: a guy named Skagra, and with a name like that he's ''got'' to be evil. Skagra's putting the finishing touches on a brain-in-a-jar -- actually, a collection of great minds, whom he'd lured into working with him under false pretenses and then mind-napped -- and just needs one more mind. Specifically, he wants the mind of legendary Time Lord criminal Salyavin, who was said to have the power to project his own mind into other minds; with this power in Skagra's brain jar, he'd be able to control the rest of the universe. Salyavin is imprisoned on the prison planet of Shada, whose location has been lost for centuries, but Skagra is convinced that the directions are in Chronotis' book.

By the time Chronotis remembers Chris Parsons' name (going through the alphabet until he reaches "Y"... "Young Parsons!"), Skagra has parked his spaceship outside town and gotten a lift to St Cedd's. The Doctor's just left, though -- he's borrowed a bike and gone off to fetch Chris from the physics lab, little realizing that the guy he nearly crashed into on the way was Chris himself, on ''his'' way to see Chronotis to ask about the book.

The Doctor does meet Clare at the lab; with her in tow, and in possession of the book, they return to Chronotis' flat -- to find the old professor dead, killed by Skagra while Romana was in the TARDIS looking for milk for the tea. With the help of some Time Lord technology, Chronotis manages to convey a final message: watch out for Shada.

Shada turns out to be a prison planet, and the gang soon all find themselves there. The Doctor is (of course) captured by Skagra, fibs his way through an interrogation by pretending to be ''really'' dumb, and is promptly killed by a very annoyed Skagra. However, the Doctor knows enough about this sort of thing to relax his mind at the last moment, meaning Skagra only gets a ''copy'' of his memories and the Doctor continues to live. He convinces Skagra's ship that, since he's now dead, he's not a threat anymore and the ship can freely listen to him. The ship is a bit confused, but rolls with it.

Professor Chronotis, meanwhile, is OnlyMostlyDead and uses Clare to track down the others (using his TARDIS, which turns out to be have been ''his living room'' all along). He also turns out to be Salyavin. Once the Doctor rejoins the plot (after taking a short unprotected trip directly through the vortex and MacGyvering one very silly mind-shielding helmet), he's able to mind-control Skagra's golems and prevent the AssimilationPlot. He and Romana decide to simply drop Chronotis/Salyavin off back home, since rumours of his great evil were probably for the most part just exaggerated nonsense. The Doctor wonders if people will say the same about him someday.

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!!Tropes

* ActuallyIAmHim
* AccidentalMisnaming: Chris introduces himself as "Chris Parsons, Bristol Grammar School". The Doctor appears to misparse this phrase, and refers to Chris as "Bristol" thereafter.
* AdaptationalAttractiveness: The animated version sexes up Claire from a woman dressed in mainstream (and nowadays slightly silly) late-70s fashion into a late-70s British [[PunkRock Punk]], bondage gear and all. Chronotis is also much more handsome.
* AdaptationalHeroism: From the TV version to the webcast, Salyavin moves from a reformed villain to someone who was never actually a villain at all, but just misunderstood.
* AlphabeticalThemeNaming: Names of major heroic characters and places introduced in the story begin with the letter "C" - Chris, Claire/Clare, Chronotis, Cedd's College. Names of major villanous characters and places begin with the letter "S" - Skagra, Shada, Salyavin, Sujatric and Rundgar, Scintilla, the Ship.
* AsideGlance: [[spoiler: The Doctor pulls one at the end of the 2017 version; after discussing with Romana how he one day wants to be seen by others as a "nice old man" akin to Professor Chronotis, he turns to the camera and grins - revealing ''he's'' now being portrayed by Tom Baker aged in his eighties!]]
* AssimilationPlot: "The Universe, Doctor, as you so crudely put it, will not be ''mine'', the Universe will be ''me!''"
* AuthorAppeal: Creator/DouglasAdams set the story in his own Cambridge University.
* BrainInAJar
* BreakTheHaughty: Skagra. We first assume he is an EvilGenius and a totally logical, emotionless overlord, but we begin to realise he's actually an awkward nerd, alienated by his incredible intelligence and socially tone-deaf as a result, who is [[IJustWantToBeSpecial in love with an image of himself as a logical, emotionless overlord]]. His breakdown is caused by the Doctor, who [[TricksterArchetype enjoys being intentionally annoying]], managing finally to get under his skin enough that he begins to act like the tantruming ManChild that he is.
* CaptainObvious:
-->'''Romana:''' (To the unconscious Professor Chronotis) Professor!\\
'''K9:''' No response, Mistress.
* ContinuityAnnouncement: The 2017 completed version has a period-accurate one at the beginning of the serial, complete with the announcer apologising for [[UnderStatement broadcasting the story later than planned]].
* ContinuitySnarl: So... which version of "Shada" ''really'' happened? Did Romana and the Fourth Doctor meet Chronotis, or did the events of "[[Recap/DoctorWho20thASTheFiveDoctors The Five Doctors]]" distract them and it wasn't until four lives later the Doctor remembered to go back? We'll probably just have to blame the Time War...
* EndOfAnEra: Though never broadcast, this story marked the end of the following features of the show from a production standpoint:
** The 1967 arrangement of the theme by Delia Derbyshire.
** The tunnel opening sequence by Bernard Lodge and the diamond series logo introduced in "[[Recap/DoctorWhoS11E1TheTimeWarrior The Time Warrior]]".
** Graham Williams's tenure as producer; the rest of the show's original run would be produced by Creator/JohnNathanTurner.
** Creator/DouglasAdams's tenure as script editor.
** Dudley Simpson's tenure as incidental music composer.
** David Brierley as the voice of K9; John Leeson would reprise the role the following season onwards.
** The Fourth Doctor's multicolour scarf and brown frock coat; the following season would feature the Doctor (in Tom Baker's final season on the show) in a burgundy & purple scarf and a larger burgundy frock coat.
** The TARDIS prop designed by Barry Newberry; the next nine years of the show's original run would utilize a new, fibreglass prop designed by Tom Yardley-Jones.
** The use of six-part stories; all future serials would span four parts at most.
* EveryoneKnowsMorse: Although in this case it's Gallifreyan Morse.
* EvilIsHammy: The Doctor teases Skagra about his emotionlessness being an affectation, because there is no ''way'' he would be fighting someone who didn't have a "manic gleam" in the eye and keep announcing things like "The universe belongs to me!!" Skagra pretends to be above that sort of thing, but still heads headfirst into VillainousBreakdown between his plan failing and the Doctor intentionally annoying him, eventually being reduced to having a manic gleam in the eye and shouting things like "The universe belongs to me!"
* {{Expy}}: Professor Chronotis is something of an Expy of the retired Fourth Doctor Creator/DouglasAdams originally wanted to write this serial about. Later, another expy of the Fourth Doctor (Dirk Gently) and an expy of Chris (Richard) showed up in ''Literature/DirkGentlysHolisticDetectiveAgency'', starring alongside a {{Transplant}}ed Professor Chronotis. The character of the Curator in "Day of the Doctor" owes rather a lot to Chronotis as well.
* GoneHorriblyRight: The Doctor convinces the computer that he's dead and [[Literature/{{Redwall}} a dead enemy ain't an enemy no more]]. However, "dead men do not require oxygen."
* GrandTheftMe
* HamToHamCombat: Paul [=McGann=] vs Andrew Sachs, in the Creator/BigFinish audio version. It's [[CrowningMomentOfFunny rather magnificent]].
* HeelFaceTurn: Salyavin, aka Professor Chronotis.
* HotterAndSexier: For some reason, the animated version's Claire is a lot less conservatively and more punkishly costumed than the live-action version, with a pink fluffy [[SweaterGirl sweater]] showing quite a bit of cleavage, a goth-influenced make-up job, and a ''studded leather dog collar''. The animated Chronotis is also [[GrandpaWhatMassiveHotnessYouHave rather more well-preserved]] than the live-action one.
* InkSuitActor: In the animated version. Obviously this is required for the Eighth Doctor and Romana since they appeared in live-action TV, but it extends to the human and humanoid guest characters, who look much more like their voice actors than the actors in the live-action version.
* InsaneTrollLogic: The Doctor convincing the ship's computer that he is dead "in a fabulous display of illogic logic" in order to get it to release Chris and K-9.
* IWasQuiteALooker: Chronotis. Justified in that between his handsome young appearance, seen briefly by the Doctor in a psychic vision, and the way he looks now, he not only aged about 900 years but regenerated.
* LargeHam: The audio version features an incredibly Hammy turn from Andrew Sachs of ''Series/FawltyTowers'' fame as the [[SissyVillain hysterically camp]] BigBad Skagra.
-->"''REMOVE'' all the contents of his ''MIND?'' Why not? [[EvilLaugh Muah-ha-ha!]] ''[[EvilLaugh Muah-HA-HA!]]'' '''[[UpToEleven AH-HAH-HA-HA-HAAAA!]]'''"
* LettingHerHairDown: Clare in the live-action TV version, after she accidentally takes Chronotis's TARDIS off.
* LiteralMinded: Neither rhetorical questions nor expletives are a particularly good idea around K-9.
* LogicBomb: The Doctor gets attacked by Skagra while snooping around his ship. After the villain attacks the Doctor, the Doctor puts himself into a state of FauxDeath thanks to his BizarreAlienBiology so he can escape. During this, The Ship, who is extremely obsequious towards the villain, scans the Doctor and confirms him dead. When the Doctor gets up and starts walking around and talking to it, the Ship is extremely confused, since it can't understand why he is talking if he is dead, and suggests rescanning him. At this point, the Doctor takes advantage of the situation by convincing it that the Ship does not need to rescan him, as her master is infallible, and she is therefore infallible. Therefore, her reading was right, the Doctor is dead, and as he is dead he cannot order her to do anything that would cause any harm to her or to her master, [[InsaneTrollLogic so she should start obeying his commands]]. The Ship starts listening to him, but [[GoneHorriblyRight also turns off the oxygen as there are no live people on board, and finds the Doctor's request to turn it back on illogical]].
* {{MacGuffin}}: The book.
* MindRape: The first victims of Skagra's device. Most victims are simply killed, but the first six people were left alive and so nonfunctional by the experience that they are unable to talk or care for themselves. The Doctor is eventually able to communicate with Akrotiri, one of the victims, by connecting Chris's brain to his - and Akrotiri's brain is so wrecked that the experience is excruciatingly painful for Chris (defying this trope, the Doctor tells Chris that this might happen and gets his consent first).
* MyNaymeIs: For some reason, Clare is spelt without an "i" in the script book and credits of the video version. The webcast goes for the standard spelling.
* MythologyGag: In the closing scene, the Doctor ponders a future in which he retires and everyone assumes he's just a "[[RunningGag nice old man]]". This is a reference to the original Douglas Adams story written for this serial slot - a story about the Doctor retiring from his travels, an idea that excited him but was killed by ExecutiveMeddling.
* NamedByTheAdaptation: David Taylor.
* NiceHat: Romana again. Just check out the page image.
* {{Oxbridge}}: Fictional Cedd's College in actual Cambridge.
* PenalColony: Shada itself.
* PunnyName: The men in the Think-Tank have weirdly jokey names, e.g. RAF Akrotiri (the name of an airforce base in Cyprus), GV Centauri (a star), AST Thira (Ast-Thira refers to a flight route within Greece.)
* PutOffTheirFood: Early in the episode, Chronotis offers to make tea for Chris. Chris changes his mind upon learning he apparently uses ''lumps'' of milk.
* SapientShip: Skagra's Ship, which he has programmed to have a matronly voice and to view Skagra with awe and worship. The Doctor inadvertently uses a small LogicBomb on it to get out of a scrape, and its attempts to reconcile the faulty logic with its observations lead to it questioning its entire worldview.
* ShaggySearchTechnique: Clare is searching Prof. Chronotis' study and discovers the controls to his TARDIS by leaning on a bookshelf.
* ShoutOut:
** In the animated version, the Doctor's brain-amplifying headgear is built around [[CallBack the Second Doctor's "witch's hat"]] and a [[Series/StarTrekTheNextGeneration spacesuit helmet labelled "NC-1701D"]].
** The VictimOfTheWeek in the webcast is made into a vintage car enthusiast. He's particularly fond of the [[Franchise/TheHitchhikersGuideToTheGalaxy Ford Prefect]].
** Creator/DouglasAdams named the characters of Chris Parsons and Clare Keightley after his friend Chris Keightley, president of the Cambridge Footlights.
** The Thinktank scientists all bore names associated with Greek islands: Caldera, Akrotiri, Ia, Santori and Thira.
* SiliconBasedLife: The Kraags, probably.
** In the BBC Video version, Creator/TomBaker states that they're made of "crystallized coal."
* SissyVillain: One of the flaws Creator/DouglasAdams noted about his script was that he'd written Skagra in this way, which he admitted was lazy on his part and neither funny nor frightening, especially in comparison to the dynamic and interesting villains in his much preferred script "[[Recap/DoctorWhoS17E2CityOfDeath City of Death]]". He is RescuedFromTheScrappyHeap in the Creator/BigFinish adaptation (in which he gets a ridiculously [[LargeHam hammy]] performance from Andrew Sachs).
* SpotOfTea
* WeirdnessCensor: Professor Chronotis has been living in the same set of rooms at Cambridge (actually his TARDIS, which is '''even more''' out of date than the Doctor's) for ''centuries''. According to him everyone at the old Cambridge colleges are very discreet.
* WhatWeNowKnowToBeTrue:
-->'''The Doctor''': What? Do you understand Einstein?\\
'''Parsons''': Yes.\\
'''The Doctor''': What? And quantum theory?\\
'''Parsons''': Yes.\\
'''The Doctor''': What? And Planck?\\
'''Parsons''': Yes.\\
'''The Doctor''': What? And Newton?\\
'''Parsons''': Yes.\\
'''The Doctor''': What? And [[TheLastOfTheseIsNotLikeTheOthers Schönberg]]?\\
'''Parsons''': Of course.\\
'''The Doctor''': You've got a lot to unlearn.
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[[Creator/TomBaker SHAAAAADAAAAAA!!]]
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