->'''Heavenly Host:''' Information: the ''Titanic'' is en route from the planet Sto in the Cassavalian Belt. The purpose of the cruise is to experience primitive cultures.\\
'''The Doctor:''' ''Titanic''. Um... who... thought of the name?\\
'''Heavenly Host:''' Information: it was chosen as the most famous vessel of the planet Earth.\\
'''The Doctor:''' Did they tell you ''why'' it was famous?

Just as we exoticise other cultures, apparently, aliens exoticise ours. Or the parts of Earth culture they like, stuck together willy-nilly, so that the end result is a charming Old Earth Christmas pleasure cruise... set aboard a spaceship recreation of Earth's most famous ship, the ''Titanic''.

The Doctor, who's appeared aboard after accidentally crashing into it (picking up from the last episode), can recognise a dire portent when he sees one. Sure enough, it's not long before trouble arises: the ship's mechanical servants start to malfunction and harm people, plus the ship's captain deactivates the spaceship's shields, then magnetises the hull to purposely attract three blazing meteors so they crash against the ship. From this point on,all hell breaks loose.

The Doctor has the usual motley collection of eccentrics around him: nice waitress Astrid (who the Doctor picks as his next companion), HappilyMarried contest winners Morvin and Foon, {{Jerkass}} Rickston Slade, Mr Copper, the alleged Earth expert, and Bannakaffalatta, the spiny red cyborg ([[FantasticRacism though don't tell anyone]]). They first try to make their way to the bridge, which is now under the inexpert if enthusiastic command of one Midshipman Frame, after the captain's untimely death. But one of the evil Christmas angel robots is coaxed into revealing that the ''real'' source of evil leadership is on Deck 31. Now they must defy the dying ship and the creepy angel robots to get there.

And creepy they are. When a pocket of survivors comes to Midshipman Frame's attention, he can't do much more than watch helplessly as the angels ''kill'' them.

Still, they haven't spotted the Doctor ''et al'' yet, as the motley crew sneaks through the ship's secret passages.

There are deaths. The Doctor discovers that he gets to ask the Host (the robot angels) three questions, but wastes two of them. Eventually, Deck 31 is reached and proves to contain the ''Titanic'''s ludicrously wealthy yet cyborgified and unhappy owner, Max Capricorn, who is bent on crashing it into Earth and riding out the collision in an impact-proof chamber, in a complicated revenge scheme against the board of directors which owns the ship and locked him out of the company. And the Doctor is powerless in the arms of the robot angels, so Astrid has to take the HeroicSacrifice on herself.

With Capricorn dead, the Doctor now has full command of the Host, and messianically spreads his arms to have the angels carry him up into... the control room. He calls Buckingham Palace to have it evacuated, and even manages to keep the ''Titanic'' from crashing into London. The Queen waves at him as he sails past.

What's left of Astrid gets a final kiss from the Doctor and becomes stardust. Mr Copper asks if he can come along in the TARDIS as the next companion, but the Doctor ''really'' doesn't want any more companions right now, after having all the of the previous ones either lost forever or in love with him or both. However, Mr Copper also happens to have one million pounds sterling in his bank account, so he probably won't be struggling in the future.

!!Information: This episode contains examples of the following tropes

* AnyoneCanDie
** The deaths of Morvin and Astrid are very [[DroppedABridgeOnHim unexpected]].
** As are Foon's and Bannakaffalatta's.
** And subverted with Slade surviving, despite having AssholeVictim writen all over him.
* ArtisticLicenseHistory: InUniverse, "To repeat, I am Mr Copper, the ship's historian, and I shall be taking you to old London town in the country of U.K. ruled over by good King Wenceslas. Now, human beings worship the great god Santa, a creature with fearsome claws, and his wife Mary. And every Christmas Eve, the people of U.K. go to war with the country of Turkey. They then eat the Turkey people for Christmas dinner... like savages." Don't worry, this is what you get for trusting someone who has [[BlatantLies a first-class degree in Earthonomics]].
* BadassBoast: "I'm the Doctor. I'm a Time Lord. I'm from the planet Gallifrey in the constellation of Kasterborous. I'm [[ReallySevenHundredYearsOld 903 years]] old, and I'm the man who's gonna save your lives and all six billion people on the planet below. You got a problem with that?"
** Also a rather unfortunate case of UnspokenPlanGuarantee.
* BittersweetEnding: Let's face it, if it wasn't for kind Mr. Copper profiting from this it would have been a full-fledged DownerEnding.
* BoringInsult:
-->'''The Doctor:''' All of them slaughtered, and why? Because Max Capricorn is a ''loser''.\\
'''Max Capricorn:''' I ''never'' lose!\\
'''The Doctor:''' You can't even sink the ''Titanic''!
* BowTiesAreCool: The Doctor dons one as a part of his outfit to blend in on board.
* CallBack / BrickJoke: The Doctor being pleased when he finds out Alonzo's name and then saying "Allons-y, Alonzo!" is a reference to [[Recap/DoctorWhoS28E12ArmyOfGhosts "Army of Ghosts"]].
* {{Camp}}: With bells on.
* TheCaptain: Captain Hardaker, who has been paid off to wreck the ''Titanic''.
* ChestBlaster: Bannakaffalatta produces an EMP from his chest to take out several Robot Angels at the cost of his life.
* ChristmasEpisode / AnAssKickingChristmas: "Look, I don't know where you're getting your information, but you're completely wrong. Christmas isn't a barbaric festival of blood. It's about love and thanksgiving and generosity and... who am I kidding, all of my Christmases are like this."
* CrushKillDestroy: Information: Kill! Kill kill kill!
* {{Cyborg}}:
** Bannakaffalatta
** Max Capricorn
* DamageControl: Frame does what he can from the Bridge to keep ''Titanic'' in orbit and to keep the power up.
* DeadlyDisc: The Robot Angel's halos.
* DeadStarWalking: Literally.
* DespairEventHorizon: When Morvin falls into the engines, his wife Foon doesn't see much to live for and does a TakingYouWithMe with a Host as she jumps into the engines herself.
* DisorganizedOutlineSpeech: The Doctor's rescue plan. The second one this year after the one given to Martha in [[Recap/DoctorWhoS29E8HumanNature "Human Nature"]].
* DisproportionateRetribution: Max Capicorn gets ousted by his own board of trustees and blamed for the company's failure. So he contrives to crash the ''Titanic'' (2000 killed) into Earth (6 ''billion'' killed) and get the trustees jailed for mass murder. ''Wow.''
* DistressedDude: Creator/DavidTennant gets manhandled ''a lot'' in this episode.
* DoomedContrarian: Subverted in the case of Rickston Slade. He's a rude, selfish asshole, and there's little doubt that the audience is just waiting for the sweet catharsis that his death/comeuppance will bring. He's one of the few people who live, and he walks away from the whole thing ever richer, because he just invested in the rivals of the spaceliner that had the accident. The look on the Doctor's face when Slade is thanking him and explaining his good fortune was probably shared by more than a few audience members. And then he ''literally'' just walks away from it all. No last-second comeuppance or ''anything''.
* DrivenToSuicide: Poor Foon...
* {{EMP}}: Used to take out the robot angels by Bannakaffalatta and then with the piece salvaged from his cyborg body.
* {{Expy}}:
** The Hosts look and act like the antagonists of a serial from the Tom Baker years, [[Recap/DoctorWhoS14E5TheRobotsOfDeath "The Robots of Death"]].
** Well, this is a little over six months after [[Recap/DoctorWhoS29E10Blink angels which stood still in the background at first, then started killing]]. Perhaps played on, slightly, when a technician says that the robots are "on the blink".
* FantasticRacism: Against cyborgs. At least they are allowed to marry now.
* FascinatingEyebrow: The Doctor, during Mr. Copper's [[BlatantLies lecture on Earth history]].
* FlatWhat: At the ColdOpen, the Doctor's trademark escalating [[BigWhat "What? WHAT?]] ''[[BigWhat WHAT?!]]''" ends with a lifebelt rolling into his hands with the word "TITANIC" written on it. Cue this.
* ForegoneConclusion: Information: It's a ship called the ''[[TemptingFate Titanic]]'', [[SarcasmMode surely this will be a smooth voyage with absolutely no danger at all.]] It even hits something in the very first scene of the episode -- the TARDIS!
* ForkliftFu: Astrid uses one against Max Capricorn.
* GenreSavvy: At last, the people of London have remembered the [[ContinuityNod weirdness that seems to happen around]] {{Christmas|Episode}} and fled ''en masse.'' London is now a ghost town.
* AGodAmI: The Doctor's anguished cry of "I can do ''anything''!" Then he must confront the fact that for how often he's ranked himself with gods, he really isn't, and really can't.
* GoingNative: The Doctor indirectly admits that Earth is the closest thing to a home he's got without Gallifrey.
* GoryDiscretionShot: It's only assumed -- but with very good reason -- that the trapped technician is decapitated by the Host's halo.
* GravitySucks
* HappilyMarried: Morvin and Foon.
* HeroicSacrifice ''Lots'' of these. Poor Foon, Bannakaffalatta and Astrid...
* HopeSpot: Astrid was wearing a teleporter bracelet! Surely those must have some kind of safety feature! They do, but it got broken in the chaos and the Doctor only can reassemble half of her, leaving her as a ghost. He's forced to MercyKill her, turning her into stardust so she could fly through the universe as she always wanted to.
* HumanAliens: Be honest, apart from Bannakaffalatta, does anyone on board ''really'' look like they're from another planet?
** And he's a cyborg
* HumansThroughAlienEyes: New Zealand may be beautiful, but this is just a street. Astrid thinks it's riveting.
* IAlwaysWantedToSayThat: Twice.
** "Allons-y, Alonzo!"
** "TakeMeToYourLeader"
* InconvenientSummons: The Doctor is teleported back to the ship while in the middle of a conversation with Donna's grandfather.
* InsistentTerminology: Bannakaffalatta, takes it personally when the Doctor tries to call him "Banna".
* ItsACostumePartyISwear: The higher-class passengers tell Morvin and Foon the Christmas party is Fancy Dress.
* {{Jerkass}}: Rickston spends the entire episode with one KickTheDog moment after another, trying to leave people to die and insulting people and insisting that, e.g., he be the first one across the dangerous bridge. However, even he gets a PetTheDog moment witnessing the death/recording of Astrid. Then he spoils it at the end by talking about how much richer he is. Jerk. If nothing else, part of the reason he seems happy is because it screwed over the other batch of [[CorruptCorporateExecutive Capricorn's Board of Directors]] who share responsibility for the disaster.
** JerkassHasAPoint: Him declaring the officer who opens a dead airlock, despite the Doctor's warnings, and insists everything will be alright, an idiot.
*** Also, while it's mean-spirited and in bad taste, even Morvin ([[FamousLastWords as his last words]]) admits that Ricktson's demand that Morvin and Foon, the two heaviest members of the group, should go last across the precarious bridge, is totally sound and sensible.
** JerkWithAHeartOfGold: He solemnly thanks the doctor and hugs Copper tightly...
*** JerkWithAHeartOfJerk: [[KarmaHoudini Just before giddily informing the Doctor he profited off the disaster.]]
* JustAFleshWound: Midshipman Frame does rather well for having been shot early in the episode, albeit spending most of his time painfully clutching a chest wound.
* KilledMidSentence
* KillEmAll: Information: You are all going to die. Oh, wow, does it ever fill that one.
* LeaveNoWitnesses: Information: It is the plan.
* LightIsNotGood: Information: Shiny white-and-gold angels! ''[[UncannyValley Creepy]]'' shiny white-and-gold [[SuperPoweredRobotMeterMaids robot]] angels that decapitate people with their halos.
* LiteralGenie: Information: The angels will answer three questions. Any three questions? Wait, I didn't mean to do that, can I take it back? What do you mean, "No"?
* MauveShirt
* MeaningfulName
** Played straight with the ''Titanic''.
** Averted with Astrid, whose name is an anagram of TARDIS (causing much speculation online), but nothing comes of it.
*** On the other hand, although its etymology is different, the name Astrid evokes the Latin word ''aster'', meaning "star", while ''peth'' is Welsh for "thing"; therefore ''Astrid Peth'' could be taken to mean "star thing", which is highly plot-relevant.
* MenAreTheExpendableGender: Averted. The four ''Titanic'' survivors (including the Doctor) are all male, in stark contrast to the actual Titanic.
* MoralMyopia: Captain Hardaker, while upset that he was given a young man on the crew, still seems to think that the money for his family is worth killing all of the passengers, as well as the billions of people who live on Earth.
* NoOSHACompliance: Long two-foot-wide metal bridges as the only way over a nuclear reactor engine? Though the area was damaged from the whole meteors striking the ship. Then again, Max did want the thing to fail...
* OhCrap: Information: You are all going to die.
* OverlyLongName: Bannakaffalatta
-->'''The Doctor:''' Look, can I just call you Banna? It's going to save a lot of time.\\
'''Bannakaffalatta:''' No. Bannakaffalatta.
* {{Pun}}: The Doctor's joke about "How to get ahead in business" does not really go over well.
* PhonyDegree: Mr Copper's degree in Earthonomics, which he eventually admits came from Mrs Golightly's Happy Travelling University and Dry Cleaners.
* PluckyMiddie: Midshipman Frame: Much to the displeasure of Captain Hardaker, [[ForeShadowing who was promised he'd have no young officers on this voyage.]] Frame ends up holed up in the Bridge trying to help where he can.
* PreAsskickingOneLiner: A couple of ''awesome'' occasions. Too bad they both pretty much precede a HeroicSacrifice.
-->'''Bannakaffalatta:''': Bannakaffalatta proud! Bannakaffalatta CYBORG!\\\
'''Astrid:''' Mr Capricorn... I resign.
* RecycledInSpace: ''The Poseidon Adventure'' [-IN SPACE-]! It's even lampshaded, since the space ship is appropriately named ''The Titanic''.
* RunningGag:
** Another Christmas, another disaster menacing London. This time the citizens wise up and evacuate the city to stay safe of whatever could happen. And once again, the "snow" falling during Christmas is actually spaceship's ashes.
** Geoffrey Palmer makes his third appearance in ''Doctor Who'' and, as in the previous two, gets killed very quickly.
* ScrewThisImOuttaHere: Meant in a good way with Bannakaffalatta when everyone realizes that fighting off the Hosts with pieces of iron and instead opts for a HeroicSacrifice.
* ScullyBox: Music/KylieMinogue's diminutive height is exploited by having Astrid pull up a box and stand up on it in order to give the Doctor a goodbye kiss.
* ShoutOut
** To ''VideoGame/StarshipTitanic''.
** Information: The penultimate security protocol number the Doctor tries on the host before settling on 1 and getting a result is [[Franchise/TheHitchhikersGuideToTheGalaxy 42]].
** The story contains a number of Shout Outs to the work of ''Doctor Who'' scriptwriter and later ''Series/BlakesSeven'' script editor Chris Boucher. The look and personality of the Hosts is based on the killer robots in Boucher's Fourth Doctor story "The Robots of Death". The damaged Host repeating "Kill... kill", the Host's hand stuck in the door, and the secret room full of Hosts on stretchers are also direct copies of moments from the same story. The teleport bracelets are from ''Blake's 7'', and the Angels' "Information:..." catchphrase is from Zen, the ''Liberator'' computer in ''Blake's 7''.
** The damaged cruiseliner and passengers having to make their way through precarious, badly damaged, collapse-at-any-moment, tilted areas and makeshift catwalks references ThePoseidonAdventure and its numerous remakes.
* SlowMotionFall: Any time someone falls to their death. [[DarkerAndEdgier Which happens frequently, to people you like]].
* SortingAlgorithmOfMortality: Subverted. Every scrap of GenreSavvy says that [[{{Jerkass}} Rickston]] will have [[DroppedABridgeOnHim a bridge dropped on him]] early on, while Astrid will survive and leave with the Doctor; [[KarmaHoudini no such]] [[HeroicSacrifice luck]].
* SpaceIsAnOcean
* SpaceSailing
* StellarName: Astrid was named as a more subtle version of "Astra". [[SuspiciouslySpecificDenial The anagram is apparently just a coincidence]].
* StupidSacrifice
** Foon really didn't need to throw herself off the bridge with the Host once she roped it. It's implied she was DrivenToSuicide.
** Neither did Astrid. They explicitly showed the brakes were cut, but the forklift was moving slow enough she could have easily jumped clear.
* SuperPoweredRobotMeterMaids: Information: The Hosts are meant to be servants and decorations, yet their halos can decapitate people. Justified, though; they were installed because the owner was planning to use them to [[KillEmAll kill everyone]].
* TakingYouWithMe: Foon takes a Host with her when she decides to kill herself after her husband's death.
* TeleportersAndTransporters: Through the bracelets they give to the passengers. It can also theorically recuperate a killed passenger, but when the Doctor tries this with Astrid, the system is too badly damaged.
* TemporaryLoveInterest: Astrid
* TemptingFate / WhatDidYouExpectWhenYouNamedIt: A ship called the ''Titanic''! WhatCouldPossiblyGoWrong Invoked actually -- it was named after the "most famous ship of Earth" -- they just didn't know what it was famous ''for''. And the passengers, having no idea of Earth culture, had no idea of the original ship's history.
** Further justified in that, given Max's plans and depending on when the ship was built, it could've been a sick joke on his part.
* ThirdPersonPerson: Bannakaffalatta, though wouldn't ''you'' be if you had a name like that?
* TwinkleSmile: Max Capricorn's repeating advertisement has a tooth that does this when he says "My name is ''Maaaxxx''".
** BrickJoke: When the Doctor gets to meet him for real, the same tooth twinkles with the "my name is Max" bit. "It really does that?"
* UnflinchingWalk
* UpUpAndAway: The two Hosts carrying the Doctor takes this pose with their free arms to crash through the deck.
* VerbalTic: Information: The Host cannot begin a single sentence without first saying: "Information".
* WealthyEverAfter: Mr Copper.
* WholePlotReference: ''Film/ThePoseidonAdventure'' [[RecycledInSpace IN SPACE!]]
* WritersCannotDoMath: If 1 million pounds is roughly 50 million credits, that means that the 5000 credit phone bill that Foon and Morvin were lamenting and talking about never being able to pay was roughly... 100 pounds.
* WhamLine: retroactive and probably accidental, but after Foon's death The Doctor swears 'No More'.
* TheXOfY
* YouAreInCommandNow: Midshipman Frame ends up being the only officer on the bridge after Captain Hardaker gets the ship rammed by meteors.