[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/mo_ha01.jpg]]
[[caption-width-right:350:The penultimate classic story goes out of its way to give us all night terrors.]]
->''"I am the only one left now. I raise these stones to my wife, Astrid. May she forgive my sin. The day grows dark, and I sense the evil curse rising from the sea. I know now what the curse of Fenric seeks: the treasures from the Silk Lands in the east. I have heard the treasures whisper in my dreams. I have heard the magic words that will release great powers. I shall bury the treasure for ever. Tonight, I shall die, and the words die with me."''

The Doctor and Ace step out of their TARDIS into a 1940's English naval base, where Dr. Judson is using his ULTIMA machine[[note]]That would be AlanTuring and the ENIGMA machine.[[/note]] to crack inscriptions written on a Viking crypt. The inscription turns out to be a trigger for the eponymous curse and the awakening of an ancient evil named Fenric. What follows is a GambitPileup between Fenric and the Doctor.

Oh, and there's vampirism in the form of Haemovores and CharacterDevelopment on the part of Ace.

Watch it [[http://www.dailymotion.com/playlist/x1322q_tardismedia_the-curse-of-fenric/1 here]]

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!!This episode provides examples of:
* EightiesHair: Two of the Haemovores' victims have this. In the ''1940s''.
* AllThereInTheManual: Like several novelisations of 1980s ''Doctor Who'' stories, the novel fleshes out several of the characters; in particular, it quite heavily implies a homosexual relationship between Millington and Judson in their backstory and feelings between the two London evacuees to an even greater degree than the TV episodes, and it reveals that Judson's nurse is a Soviet spy informing on the ULTIMA project to the Russians.
* ApocalypticLog: Most of the runes being translated by Dr. Judson tell the story of a Viking who was part of the raiding party who acquired the 'treasures' that included Fenric's resting place... and the terrible misfortunes that befell them. It ends bleakly.
* BavarianFireDrill: The Doctor wanders onto a secret naval base, bypassing a patrol holding them at gunpoint by barking orders and nitpicking about uniform cleanliness, breezing into an office and proceeding to write his own letter from the War Office, which he promptly hands over to yet more soldiers as proof of his right to be there.
* BreakHerHeartToSaveHer: Or rather, Break Her Heart To Save The World, which doesn't make it any less [[TearJerker painful]].
* CallBack: To "Dragonfire" and "Silver Nemesis", it is revealed Fenric was manipulating these events.
** The Doctor mentions his companions so his faith in them will hold back the Haemovores.
* TheChessmaster: The Doctor, to the point where even Ace is frustrated by his scheming.
** In Part 4, he and Fenric become ''literal'' Chessmasters.
*** Contrast with the fact that the events of this episode are because Fenric wasn't actually a [[IncrediblyLamePun Master of Chess]] when they first met
*** For all we know, neither was the Doctor. His winning move (getting the other side's pawn to turn against him) is ''blatantly'' illegal.
* ClapYourHandsIfYouBelieve: Played straight, then horribly subverted with Reverend Wainwright's death.
* {{Cthulhumanoid}}: The Ancient One
* CultureClash: Kathleen is insulted when Ace (being from TheEighties) assumes that she wasn't married, despite her having a child.
* DeathNotification: Kathleen gets a telegram notifying her of her husband's death.
* DemonicPossession: How Fenric manifests.
* DirtyCommunists: Averted. At first, it seems the Russians are an antagonist force, what with them performing a covert mission in England, and attacking Royal Marines, and holding up the Doctor and Ace at gunpoint. As the story develops, we gain more sympathy for them, they become protagonists and the Royal Marines end up as antagonistic Mooks until they join forces.
* EldritchAbomination: Fenric is supposed to have been something from the dawn of time, possibly even earlier.
** The Franchise/DoctorWhoExpandedUniverse gives us a more accurate identification: ''Hastur'', the Unspeakable One, the Ragged King. YES, ''[[CthulhuMythos that one]]''!
* ExpositionOfImmortality: Fenric makes a speech about how long he's been trapped in the bottle since El-Doktar confounded him with the ''"contest of traps."'' The Haemovores are all dressed in period costume appropriate to the time period they became Haemovores in. Ingiger (the Ancient One) is a double subversion of this; it was brought back in time thousands of years by Fenric and has subsequently lived for a thousand years since following the flask to Maiden's Point from the Orient.
* FingerlessGloves: Judson wears them.
* GeniusCripple: Dr. Judson. Overlaps with HomoeroticSubtext in the novelization--when they were schoolboys, Millington had a thing for Judson, and one day at rugby practice, he injured his crush in a jealous rage.
* HeelFaceTurn: The Ancient One agrees to help the Doctor after realizing that Fenric was using him.
* HeroicSacrifice: The Ancient One uses the poison to kill the body Fenric is using and itself.
* HomoeroticSubtext: Between Millington and Judson, and Jean and Phyllis; the novelisation fleshes out on both couples, but even in the episodes proper there's still plenty of implications. Millington and Judson are played at least in part as an estranged couple forced to work together long after the relationship ended badly, and Jean and Phyllis, once converted to vampires, suggest that they were 'cursed' from birth, a reference both to their status as Fenric's wolves but also to attitudes towards homosexuality viewing it as an affliction or burden.
* GrandTheftMe: Fenric. Takes over Millington's body, then Judson's, then Sorin's.
* TheGrotesque: The Ancient One, the head Haemovore.
* HolyBurnsEvil: Haemovores can be repelled by faith itself. The Doctor repels them by repeating the names of all his companions, the fervently Communist Sorin repels them with a red star badge from his uniform, and Reverend Wainwright sadly fails to repel one using a bible, as the horrors of World War II destroyed his faith.
* IHaveManyNames: Fenric, according to The Doctor.
* InstantRunes: They appear in the church as Judson reads the translation.
* KillEmAll: Because it's not Series/DoctorWho if the bodies aren't piling up.
* KneelBeforeZod
--> '''Fenric:''' The choice is yours, Time Lord. I shall kill you anyway, but if you would like the girl to live... kneel before me.
--> '''Ace:''' I believe in you, Professor.
--> '''Fenric:''' Kneel if you want the girl to live!
--> '''Doctor:''' [[WhamLine Kill her.]]
* ImmuneToBullets: Bullets slow the Haemovores down, but can't kill them.
* ItWontTurnOff: The ULTIMA machine.
* LargeHam: Jean and Phyllis are two juicy slices of utter ham.
* LastOfHisKind: In the far future, pollution destroys all life on Earth except for the Ancient One.
* LukeIAmYourFather: Ace realises that Kathleen is her grandmother and the baby is her mother.
* NiceJobBreakingItHero: Ace ''twice'' gives the villains the key piece of information they need to advance the plot. Also applies to the Doctor, as his determination to keep Ace out of the way and thus in the dark (for her own safety) is what led to her not realizing what was going on, and accidentally helping the villains out of a genuine desire to guard the Doctor's back.
* NinjaPirateZombieRobot: Or rather, Alien-Viking-Fish-Vampires.
* NotEvenBotheringWithTheAccent: The story is set in and around a military base in northern England but most of the cast make no effort to sound northern; possibly justified as below, in that most of the action is set at a military base which wouldn't necessarily be populated by people from the local area. Jean and Phyllis in the script are also supposed to lose their [[LondonTown London]] accents after they get vampirised but on screen they continue to sound as if they've just come from the set of ''Series/GrangeHill''.
* NotUsingTheZWord: The Doctor states that the Haemovores are not 'vampires'. Anyone to refer to them as such is immediately corrected.
* OffscreenMomentOfAwesome: The Doctor tricking Fenric and sealing him in the Shadow Dimension.
* OminousFog
* OneSteveLimit: The author was not allowed to mention Ragnarok (though it would have been entirely appropriate given the Norse theme), in case audiences thought there was a connection with the Gods of Ragnarok in "[[Recap/DoctorWhoS25E4TheGreatestShowInTheGalaxy The Greatest Show In The Galaxy]]".
* OopNorth: Meant to be set in northern England, although few, if any, of the guest cast try to sound northern. Faintly justified in that it's mostly set on a naval base during WorldWarII; plenty of possibility for none of the sailors and marines stationed there to be from the local area. A lot of the characters aren't locals - Millington, Judson; even the Reverend Wainwright's distinctly non-Northern accent could be explained by him having gone to public school and learning to speak proper, like.
* OurVampiresAreDifferent: Besides acting more like zombies than vampires, Haemovores can be blocked by a psychic barrier created by one's faith.
* OutOfOrder: This was intended to be shown before "Ghost Light", so that Ace telling Kathleen about her fear of haunted houses would have been {{foreshadowing}}.
* PoorCommunicationKills: The Doctor's habit of not telling anyone else what's going on comes back to bite him big time.
* TheRadioDiesFirst: Enforced.
* RedEyesTakeWarning: The eyes of every person Fenric takes over turn red.
* TheReveal: That the baby is Ace's Mother.
* ShootTheDog / [[BreakHisHeartToSaveHim Break Her Heart To Save Her]] / TheReasonYouSuckSpeech: The Doctor tells Fenric that he only took Ace in because he knew Fenric's curse was inside her, all while insulting Ace and making her cry. He had a good reason, but ''ouch''.
* ShownTheirWork: 1940s computing is surprisingly accurately shown, and so are most of the details of period cryptanalysis. German cryptography really did depend on rotors, as shown, and the rotor diagram on Judson's blackboard is extremely simple but essentially accurate. On the other hand, translation of an ancient script is ''not'' "decryption", and the [[http://en.wikipedia.org/wiki/Prisoner%27s_dilemma Prisoner's Dilemma]] name-checked by the Doctor and Judson in part 1 is not an algorithm but a well-known problem in game theory.
* StuffBlowingUp: Exploding chess sets.
* TheScottishTrope: "Let the chains of Fenric shatter."
* SealedEvilInACan
* ShoutOut: Kathleen cries out "[[GoneWithTheWind Where shall I go, what shall I do?!]]"
** [[NorseMythology The Wolves of Fenric]].
* StableTimeLoop: Ace causes her own existence by sending her mother and grandmother to London.
* SwitchToEnglish: The Russian soldiers' first scene has them speaking Russian with subtitles, then their leader says "From now on, we speak only English", and they do.
* TechnicolorToxin: The poison used is green.
* TemporaryLoveInterest: Sorin is Ace's love interest for about...30 minutes.
* [[ThoseTwoGuys Those Two Girls:]] Jean and Phyllis. They don't really do much, at least not while they're alive.
* ThreeMonthOldNewborn: Audrey ([[CrossCastRole who is played by a baby BOY]])
* ToKnowHimIMustBecomeHim: Millington has his office decorated with Nazi emblems and furnishings as a means towards this trope.
* TooDumbToLive: Both the British and Soviet forces know that Haemovores are running around the area and killing people. Clearly, the logical thing to do is start attacking each other. In defence of the British, they're commanded by Millington, who is quite quite mad, and the Soviets are merely defending themselves.
* UnderwaterRuins: An ancient Viking ship sucks Viking descendants down into the water, killing them and turning them into Haemovores when the curse activates.
* ViralTransformation
* TheVirus
* WellDoneSonGuy: The reason Ace reacts so strongly to the Doctor's [[BreakHerHeartToSaveHer feigned]] [[TheReasonYouSuckSpeech rejection]].
* WhatTheHellHero: Ace lets the Doctor have it (several times) for concealing vital plot-related information from her. In particular after she accidentally tells Judson how to release Fenric.
* WorldWarTwo: Russian soldiers! The ENIGMA machine! Military bases! Nazis are absent, though.
** However there is a massive portrait of Hitler in Millington's office.
* TheXOfY
* YouHaveOutlivedYourUsefulness: Fenric is big on this trope; the moment he no longer requires the services of his army of Haemovores, he orders their destruction.