[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/tara_6284.jpg]]
->''Would you mind not standing on my chest? My hat's on fire.''
-->-- '''The Doctor'''

The search for the [[CosmicKeystone Key to Time]] takes the Doctor and Romana to the planet Tara, where feudalism and chivalry have endured. They split up to search, and Romana finds the fourth segment a few minutes in -- it's part of a statue. However, she's promptly TrappedByMountainLions and captured by the villainous Count Grendel of Gracht, who thinks she's an android double of Prince Reynart's betrothed, Strella. The actual double was created for Grendel by his IgnoredEnamouredUnderling, Lamia. This way, Grendel is trying to usurp the throne, and will succeed if Reynart doesn't show up for his coronation. Also, he's got Princess Strella locked up in his dungeon.

The Doctor, meanwhile, also gets captured, by Prince Reynart's men. He's taken off to the Prince's hunting lodge and made to repair the Prince's android double, which will be used as a decoy. Grendel's men kidnap the Prince, but the Doctor is able to modify the decoy android so it can attend the coronation in his place.

The Doctor soon realises that Grendel plans to have Romana (or Strella or the android or whoever looks the part) marry Reynart, just so Reynart can be killed that same day and Grendel can proceed to marry the "queen" and take over the country. Grendel is a little annoyed when the Doctor refuses a part in this (after stringing along Grendel with wide-eyed fake enthusiasm for a while). He commissions a Romana android to kill the Doctor, but K-9 sees her for what she is and saves the day, while Romana herself escapes. Lamia dies in the crossfire and ruins Grendel's plans of using androids, since only she had the technology.

Finally, the Doctor rows across the moat to Grendel's castle and swipes the Key segment just before the Prince's men attack the castle, leading to the Doctor and Grendel having an absolutely magnificent SwordFight. It's ended by the latter diving into the moat and escaping.

!!Tropes

* AccidentalMurder: Madame Lamia is shot down by crossbow fire. She's the only one to die in the serial.
* ActingForTwo: Mary Tamm as both Romana and Strella, not to mention all the androids.
* AffablyEvil: Count Grendel.
* AllGirlsWantBadBoys: Lamia's yearning for Grendel.
* AsLongAsItSoundsForeign: "Gracht" is Dutch for "city canal" or "moat". The actors make a valiant attempt at pronouncing it, but only get the "a" and "t" right and noticably struggle with the "ch" throughout the story. (The "g", "r" and "ch" should actually ''all'' be guttural/rolling.) As later heard in "Arc Of Infinity" and "Vincent And The Doctor", this started a time-honoured tradition of no ''Series/DoctorWho'' actor ever being able to pronounce Dutch. Of course, since the story takes place on another planet altogether, this comes with an easy HandWave here.
* BilingualBonus / VisualPun: Dutch speakers will note that Grendel escapes by jumping into the gracht (moat) of castle Gracht.
* ComeAlone
* CostumePorn: Romana's purple and green hat-coat-trouser ensemble, which is apparently fashionable on Tara. In reality, Mary Tamm herself actually designed this costume.
* EverythingsBetterWithPrincesses
* FeudalFuture
* FrickinLaserBeams: Taran [[SwordBeam swords]] and [[EnergyBow crossbows]] shoot them.
* GettingCrapPastTheRadar: Lamia's in love with Grendel, ever since he showed her his... ... ... [{{beat}}] ... "courtesy".
* TheGuardsMustBeCrazy: Sick Prisoner version.
* HeroesGoneFishing: The Doctor resolves to spend this episode fishing, leaving the leg work to Romana.
* HighDiveEscape: Count Grendel.
* HopelessSuitor: Madame Lamia to Count Grendel, and he takes advantage of it to further his ambitions.
* HotScientist: Lamia.
* IdenticalStranger: Romana and Strella.
* IgnoredEnamouredUnderling: Lamia.
* ImpossiblyCoolClothes: To quote the BBC's webpage for this episode, "The Archimandrite's hat has to be seen to be believed."
* MagnificentBastard: Count Grendel. It's even mentioned in-universe by another character.
* MedievalStasis: An odd example. The more advanced technology is used by peasants while the nobles live mostly without it.
* NamesToRunAwayFromReallyFast: Count Grendel of Gracht.
* NiceHat: But top honors for hats must go to the Archimandrite's headpiece, which is very colorful.
* RecycledInSpace: ''ThePrisonerOfZenda'' [-IN SPACE-]!
* RidiculouslyHumanRobots
* SceneryPorn: The very beautiful forests, that's not to forget the location work at Leeds Castle.
* SpeakNowOrForeverHoldYourPeace: The Doctor gets there a little too early, and has to ask if they've gotten to that part of the wedding yet.
* StellarName: Princess Strella.
* SuccessionCrisis
* SwordFight: The Doctor vs. Count Grendel, a very long and completely magnificent battle. The Doctor keeps his scarf on.
* TextileWorkIsFeminine: Strella is working on an embroidery frame in her cell, and she and Romana are happily discussing the work when the Doctor finally finds them. (They've already taken the liberty of rescuing themselves.)
* ThrowingTheDistraction
* TrapIsTheOnlyOption: Lampshaded.
* VillainExitStageLeft
* WholePlotReference: ''ThePrisonerOfZenda''.
* TheXOfY
* YouLookFamiliar: The Archimandrite is Professor Clegg, the ill-fated psychic from the beginning of "[[Recap/DoctorWhoS11E5PlanetOfTheSpiders Planet of the Spiders]]". And Lennox, the ill-fated physicist from "[[Recap/DoctorWhoS7E3TheAmbassadorsOfDeath The Ambassadors of Death]]". And Viner, the ill-fated archaeologist from "[[Recap/DoctorWhoS5E1TheTombOfTheCybermen The Tomb of the Cybermen]]". Finding religion and steering clear of professors turns out to be a good move: he survives to the end of this one.
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