[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/casandra_7468.jpg]]
[[caption-width-right:350:[[CatchPhrase "Moisturise me!"]]]]

->''"You lot, you spend all your time thinking about dying, like you're gonna get killed by eggs, or beef, or global warming, or asteroids. But you never take time to imagine the impossible. That perhaps you '''make it.''' Maybe you survive. This is the year 5.5/apple/26, five billion years in your future, and this is the day... Hold on... (the sun starts to become a red giant) ''This'' is the day the sun expands. Welcome to the end of the world."''
-->-- '''The Doctor'''

The one with the bitchy trampoline and an elegy courtesy of Creator/BritneySpears.

Written by Creator/RussellTDavies.
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Rose expresses a wish to visit the future, and the Doctor cheerfully obliges... but scorns her idea of a mere hundred years in the future in favour of five ''billion'' years. Nothing succeeds like excess!

It's the year 5.5/Apple/26 when the Doctor and Rose materialise aboard Platform One, a cruciform space station orbiting a dying star. The star is, in fact, our Sun; and in a few minutes, it will finally expand and consume the Earth. This is considered high entertainment in the future -- SnuffFilm writ large -- so there's a collection of the rich aboard the platform. The guests include a giant face in a jar called The Face of Boe (who will become important later); the last pure human, Lady Cassandra O'Brien.Δ17 (who will also become important later) and a group of tree people. One of them, Jabe, twigs (heh) to the Doctor's oddness, and persuades her PDA to identify his species.

The Doctor seems well at ease in this company, but Rose is completely at sea. She wanders off and has a few second thoughts about this adventure business, as she realises that she is five billion years in the future in the company of a manic alien.

Meanwhile, some serious weirdness is transpiring aboard the platform. Little spider robots are crawling all over the place, pulling fun pranks like lowering the space station's sun filters so as to give anyone unfortunate enough to be around a fatal suntan.

The Doctor rejoins Rose, and they watch doomed Earth spin. Rose anxiously presses the Doctor for more information on his people, homeworld, etc.; the Doctor snaps at her for excessive nosiness, gives her mobile an upgrade to make up for it, then goes off to explore the station. Rose calls her mom for a bit of reassurance. (Although the call accidentally overshoots a little, and reaches Jackie some time ''before'' Rose met the Doctor.)

After Rose insults Cassandra, the mysterious Adherents of the Repeated Meme place her in a room where another set of sun filters are descending. The Doctor saves her, but the door is stuck after being damaged by the intense rays.

Investigating the air conditioning following a mysterious shaking in the space station, the Doctor finds one of the spiders. With the help of Jabe, the Doctor sends the spider back to its masters. The Doctor realizes the Adherents of the Repeated Meme is just a meme, an idea, or in other words: a fake. They're just remote controlled robots and the actual culprit was Cassandra, who intended to create a phony hostage situation and get rich off compensation claims. She teleports away while her spiders, having infiltrated the station deep, deactivate the shields. The glass on the station's exterior begins to break under the strain.

The Doctor and Jabe rush to find the button to reset the computer, restoring the safeties: the space station was manned entirely by computers, computers the spiders compromised, and the makers of the "unsinkable" space station didn't account for this. Jabe holds down the switch to slow the deadly pathway of fans so the Doctor can reach it. Unfortunately, she's made of wood, so she catches fire and dies, and the fans start moving quicker just as the Doctor's at the last one. The Doctor, concentrating, passes through and resets the computer, ordering it to reactivate the shields at the point of the Earth's destruction. Cassandra is returned thanks to the Doctor's ability to reverse the teleport with the feed that allowed her to teleport through the heat. As she begins to dry out, she pleads for the Doctor to "moisturize her", but he lets her die, saying "Everything has its time and everything dies."

Space station saved, the Doctor and Rose go out for chips. The Doctor confides that [[WhamLine his home planet is destroyed]], and that he's the LastOfHisKind. So that's why he's been a bit moody recently. Unfortunately, it'll take another ''four years'' before we find out [[Recap/DoctorWhoS30E17E18TheEndOfTime exactly what happened]], and another ''eight'' to find out [[Recap/DoctorWho50thASTheDayOfTheDoctor the circumstances]] that lead to what happened.

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!!Tropes:

* AbsoluteXenophobe: Lady Cassandra, who declares herself the last pure human, and considers anyone who's made modifications as half-breeds and freaks.
-->"Oh, they call themselves new humans and proto-humans and digi-humans, even human''ish'', but you know what I call them? ''Mongrels.''"
* AirVentPassageway: Big enough for a plumber to fit in.
* AllThereInTheManual: Supplemental material written by RTD for a guidebook in 2005 expands on Cassandra, the Trees, and the Face of Boe.
** Cassandra's claim about having grown up as a boy are expanded upon. She repeatedly had sex changes throughout her life, usually to avoid getting into trouble when her lovers died "mysterious" deaths (like falling on a rake five times). Her birth name was Brian Cobb, and her title of "lady" was bought at auction.
** The Trees were the result of mankind selling off Brazil to pay off debt. The rainforest was acquired by the Brotherhood of Hame, and it's evolution was accelerated. Within two hundred years, the Forests of Cheem demanded autonomy, and the Brotherhood (having dealt with this situation before) acquiesced. Shortly thereafter, the Trees disappeared as one, for five thousand years, during which time they learnt of or witnessed the Time War.
** The Face of Boe's entry largely filled with {{Foreshadowing}}. Mention is made of his having children during the Fourth Great and Bountiful Human Empire, of him being impossibly old, with no-one knowing how the heck he's still alive, and that when he dies, the sky will "crack asunder".
* AllThereInTheScript: The original script describes Cassandra as having cabinets containing the first edition of ''Literature/HarryPotterAndThePhilosophersStone'' and the Magna Carta. The former would have been funny, considering that Zoe Wanamaker played Madam Hooch.
* AloneInACrowd: The Doctor returns to modern-day Earth and stands in a crowd of bustling city folk, lamenting the destruction of Gallifrey at the end of the Time War. Averted in that the Doctor is ''not'' alone: Rose is right there to comfort him.
* AlternativeCalendar: Set in the far-future year "5.5/Apple/26". A year with a number so large that it has been abbreviated through various forms of semantics. The Doctor helpfully translates that this means it's around the year Five Billion.
* AmazingTechnicolorPopulation: You've got humanoids colored shades of blue, tree blue, and pink.
* ArcWords: The Moxx of Balhoon discusses "the Bad Wolf scenario" with the Face of Boe.
* ArsonMurderAndJaywalking: This brief announcement at the beginning.
-->'''Announcement:''' Guests are reminded that Platform 1 forbids the use of weapons, teleportation, and religion.
* BewareTheNiceOnes: This is the first episode in the new series that shows the Doctor is not a man you want to be on the bad side of.
* BrainInAJar: Cassandra is a skin trampoline with two eyes and a mouth controlled by her enjarred brain.
* BreakingTheFourthWall: One of the (CGI-animated) spiders "accidentally" collides with the camera.
* CombatTentacles: Jabe retrieves one of the "peace" drones by extending a vine, then apologizes -- "I'm not supposed to show them in public."
* CompartmentShot: From inside the washing machine onto Rose's mother as she is sorting out the laundry.
* ContinuityNod: The Doctor makes reference to being on the ''Titanic'', which was established last episode.
* DarkLordOnLifeSupport: Lady Cassandra, who exists as a sheet of skin on a rack with her BrainInAJar underneath, and has to be moisturized frequently.
* DeadlyRotaryFan: The Doctor must [[DeathCourse navigate a series of these]] in order to reach an [[MalevolentArchitecture otherwise inaccessible]] switch.
* DeliciousDistraction: Rather than make a decision on whether to continue as the Doctor's companion, Rose suggests they go eat chips. The Doctor agrees.
* DepartmentOfRedundancyDepartment[=/=]ShapedLikeItself: "They're just so alien. The aliens are so alien. You look at them... and they're alien."
* DisappointedByTheMotive: Cassandra's original plan was to manufacture a hostage situation, then use the compensation money to fund more operations.
-->'''The Doctor:''' Five billion years, and it still comes down to money.
* EarthShatteringKaboom: Subversion: Earth is destroyed on-screen, but [[InsignificantLittleBluePlanet nobody in that era makes a big deal out of it]]... because it's five billion years from now, Earth's destruction was long overdue anyway, and humanity has abandoned it long before.
* EarthThatUsedToBeBetter: In the year 5-billion-or-so Planet Earth, long since abandoned, is engulfed by the sun.
* FantasticRacism: Cassandra towards "impure" humans, a very large category of life which she includes [[{{Irony}} Rose]] in. Interestingly, Rose's reaction to Cassandra isn't much different in turn.
* FateWorseThanDeath: When Cassandra suggests Rose could be "flatter", Rose immediately says she'd rather die.
* {{Foreshadowing}}:
** The big reveal is set up early, first when Jabe tries analyzing the Doctor's species, and refuses to believe it, and second when they're alone and she tells him it's a miracle he even exists.
** The Doctor doesn't answer when Rose asks him [[Recap/DoctorWhoS27E6Dalek who]] the Time Lords fought a war with.
* FutureMusic: "Toxic" is apparently a traditional Earth ballad.
* FutureImperfect:
** A jukebox is called an [=iPod=], and an ostrich is described like a dragon.
** As well as Britney Spears' "Toxic" being referred to as "a traditional ballad". Also a ContinuityNod to "[[Recap/DoctorWhoS2E8TheChase The Chase]]", when Vicki called the Beatles' performance "classical music".
** [[invoked]] Not to mention the fact that "Tainted Love" by Soft Cell is listed as the original in the "[=iPod"=]'s record changer. Their rendition is, [[CoveredUp in fact]], a cover; the original was written by Ed Cobb and recorded by Gloria Jones in 1965.
* GettingCrapPastTheRadar: Rose refers to Cassandra as a "bitchy trampoline".
* HeinzHybrid: Humans have spread out so far and interbred with so many other species that the concept of a singular "human race" no longer exists.
-->'''Cassandra:''' I am the last pure human. The others... ''mingled''. Oh, they call themselves new humans and proto-humans and digi-humans - even human''ish''. But you know what I call them? ''Mongrels''.
* HeroicSacrifice: Jabe, who allows the station temperature on her side of the fans to incinerate her, while allowing the Doctor to override the fans on his side without getting immolated.
-->'''Jabe:''' Then stop wasting time, Time Lord.
* ImStandingRightHere: "Whatever I am, it must be invisible."
* InternalHomage: The destruction of Gallifrey, which the Doctor mentions here for the first time, was also a massive StoryArc in the ''Literature/EighthDoctorAdventures'' novels.
* IronicEcho:
** As the Doctor and Rose talk about the people coming to visit Satellite One, Rose asks if he means people or aliens, to which he responds "depends how you mean people". Later, when Cassandra is caught by the Doctor, he angrily states people have died. Cassandra just blithely shoots back "that depends how you define people".
** When Rose tries to make sense of her culture shock by talking about how everyone on the platform is so alien, the Doctor makes a slightly snide and insensitive crack about how they're "lucky I didn't take you to the Deep South". After the conversation has progressed to the TARDIS's TranslationConvention, Rose reacts poorly to learning that the Doctor's machine gets inside her head and changes how it works, and that the Doctor didn't mention this. When the Doctor admits that he hadn't really considered it, Rose angrily fires back that he was "too busy making cheap shots about the Deep South".
* {{Jaccuse}}: "The Adherents of the Repeated Meme: J'accuse!"
* LadiesAndGerms: "Ladies and gentlemen and trees and multiforms..."
* LastOfHisKind:
** Cassandra is titled as the Last Human, though it's later revealed that she is the last full blooded human and that humans merely mixed into other species. It's also revealed humans were not the only earth species to do this.
** The Doctor reveals he is the last of the Time Lords.
* LegacyImplosion: The Doctor goes from being a renegade on the run to the ''last of his species'', his entire planet having been wiped out in a catastrophic war. The Time Lords, by extension, go from being pompous academics to a mythic lost race.
* ALittleSomethingWeCallRockAndRoll: Music/BritneySpears' "Toxic" is referred to as a traditional ballad, and Music/SoftCell's "Tainted Love" as classical music in the year 5 billion.
* MyGodWhatHaveIDone: After playing it up around the bizarre guests and conventions of the Platform, the Doctor clearly realises he might have been a bit hasty in bringing Rose five billion years to the future when he sees her stagger out of the room on the verge of a culture shock breakdown.
* NiceToTheWaiter: Rose is kind enough to give a drudge permission to speak (!).
* NoOSHACompliance:
** There are [[DeadlyRotaryFan giant spinning fans]] blocking the way to the reset-the-computer button. There is a switch to slow the fans down but it will cause all the heat to move past the person holding the switch.
** Also, why does Platform One even ''have'' a manual "lower sun filter" option for its occupied chambers?[[note]]Well, it ''does'' move around -- probably for those occasions when they don't need it?[[/note]]
* TheNotSoHarmlessPunishment: There's a variant, where the Doctor assumes what his {{Unishment}} will be, and is corrected.
-->'''The Doctor:''' What are you gonna do? Moisturise me?\\
'''Lady Cassandra:''' With acid.
* ObviouslyEvil: Lady Cassandra.
* OhCrap: Twice by Lady Cassandra. The first time is when she finds out the Doctor caught her, while she was in the middle of insulting the people she tried to kill behind their backs, before she was teleported. The second time is when she realizes she is without her moisturizing crew and is drying up.
* OminousCrack: The observation deck's viewing window starts cracking when the station's heat shields fail and the Sun's expansion is imminent.
* PlantAliens: "Representing the Forest of Cheem, we have... trees." Jabe is a direct descendant of the tropical rainforest.
* PrecisionFStrike:
** Surprisingly, Rose. When confronting Cassandra, she calls her a "''bitchy'' trampoline".
** While a mild version by most standards, this is also the first time that the Doctor has used profanity on screen. "What the hell's that?"
* SciFiWritersHaveNoSenseOfScale: It's strongly implied here, and shown in "[[Recap/DoctorWhoS28E1NewEarth New Earth]]", that humanity and its descendants still resemble humans, and that Cassandra only looks how she does through plastic surgery. The episode does imply that humanity has cross-bred with other species and drastically altered in other ways, however, and later episodes do nod to this by suggesting that humanity develops the ability to "experiment" with different forms, but tends to return to the "classic" template.
* ShootTheMoney: Not being familiar with running a sci-fi series, Russell T Davies spent a quite disproportionate amount of the series one budget on this episode. All the money is right up on screen, but later episodes did suffer a bit for it. [[TropesAreNotBad But it did help win over legions of both new and old fans]].
* ShoutOut: Before becoming a major part of the show's mythology, the Face of Boe was originally just a throwaway reference to an obscure narrative poem by Creator/RudyardKipling.[[note]]Specifically ''The Ballad of Boh Da Thone'', about a bandit/warlord who consistently avoids the British Army's attempts to capture and/or kill him only to be crushed to death when a fat ox driver he's trying to rob falls down off his cart on top him. Said ox driver then decapitates Boh's corpse and sends his head by parcel post as a gift to an acquaintance who was one of the aforementioned soldiers who'd tried to catch him.[[/note]]
* SingleTear: Right after Jabe comforts the Doctor over the losses he suffered in the war and he clutches her hand, a teardrop can be briefly seen falling from his right eye. To put this into perspective, this is the one and only time the Ninth Doctor cries... WarIsHell, indeed.
* SoundtrackDissonance: "Toxic".
* SpaceRomans: The Doctor mentions that a "New Roman Empire" exists on Earth in the year 12,005. Given all the countless stories showing humans in space in the future, this New Roman Empire is almost certainly a space-faring civilization.
* StockEpisodeTitles: 31 uses.
* SuddenLackOfSignal: Rose's cell phone initially does not work after travelling billions of years into the future. The Doctor mods her phone so she can still call her mother, who's still in the present day.
* SupernaturalPhone: The Doctor upgrades Rose's phone, but only after she wonders why it [[SuddenLackOfSignal doesn't work in the future]].
* SuspiciouslyAproposMusic: Rose is handling her first trip into space and the future quite well -- until they fire up the "[=iPod=]" and it starts playing a song from her own time, and she suddenly gets a massive case of culture shock and runs out of the room. The song is "Tainted Love". Also serves as {{Foreshadowing}} for Cassandra's plan once the mastermind of the plot is revealed.
-->''Sometimes I feel I've got to\\
Run away\\
I've got to\\
Get away''
* TakeThat: Rose says she is having a word with Creator/MichaelJackson while pointing at Lady Cassandra.
* TemptingFate: While the Doctor and Jabe are discussing Platform 1, he comments that she makes it sound "unsinkable". Jabe calls this appropriate, only for the Doctor to note he was once on [[UsefulNotes/RMSTitanic a ship declared unsinkable, and wound up "clinging to an iceberg"]].
* TenLittleMurderVictims: A group of aliens from across the galaxy gather on a space station to witness the death of Earth, but somebody starts to kill those on board.
* ThisBananaIsArmed: Cassandra's "moisturizers" are packing acid in their spritzers, which she reveals after the Doctor fingers her for the murders.
* TimeMaster: The Doctor shows that he has a perfect sense of timing, and that he can slow down his perception of time to the point he can walk safely through a spinning fan.
* TranquilFury: The Doctor does this after Jabe dies and he saves the Platform, coldly transporting Cassandra back to the Platform and refusing to save her as she dries out.
-->'''Rose:''' ''[as Cassandra dries out]'' Help her.\\
'''The Doctor:''' ''[glaring]'' Everything has its time and everything dies.
* TranslatorMicrobes: Rose is confused by AliensSpeakingEnglish until the Doctor explains the "gift of the TARDIS". Funnily enough, she's not happy to hear how his time machine gets in her brain and changes what she hears.
* TrojanHorse: The metal "peace" gifts and the ostrich egg.
* {{Troll}}: The aforementioned line stating religion is not allowed on Platform One is one of those controversial moments where Creator/RussellTDavies, the showrunner at the time, [[AuthorFilibuster professed his own beliefs in the narratives]] (or lack thereof). [[Recap/DoctorWhoS27E4AliensOfLondon Two episodes later]], he would add another controversial line that used the word "gay" in derogatory manner. And he would later pull a similar stunt in ''Series/TorchwoodChildrenOfEarth'' involving a religious woman's suicide after she thought "science had won".
* UnsettlingGenderReveal: Cassandra reveals in a chat with Rose that "she" was born a boy on Earth; although, considering what Cassandra was, you have to wonder if all concept of gender has long since disappeared.
* VillainExitStageLeft: Cassandra attempts to exit in a leftward direction via teleportation, only for the Doctor to teleport her back moments later -- while she's bragging to her henchmen.
* WeWillNotHaveAppendixesInTheFuture: By the looks of Lady Cassandra we won't have much of a body left in the future.
* WeWillUseManualLaborInTheFuture: Plumbers anyway.
* WhamEpisode: An otherwise ordinary episode comes with the now well-known reveal that the Doctor is actually the last of his race, and all the Time Lords (for now) were killed in the Time War.
* WhamLine:
** Courtesy of Jabe: "I scanned you earlier. The metal machine had trouble identifying your species. It refused to admit your existence. And even when it named you, I wouldn't believe it. But it was right. I know where you're from. Forgive me for intruding, but it's remarkable that you even exist. I just wanted to... ''say how sorry I am''. Cue SingleTear from Nine.
** "My planet's gone. It burned, like the Earth. I'm not just a Time Lord. I'm the last of the Time Lords."
* WhatTheHellHero: The Doctor isn't impressed by Rose's slightly xenophobic reactions to the aliens on the Platform ("Good thing I didn't take you to the DeepSouth."). Rose, in turn, isn't particularly pleased to learn that the TARDIS's TranslationConvention circuits rearrange how her mind works without her knowledge or consent -- particularly since the Doctor chose to make snide remarks about her culture shock instead of telling her this ("No, you were too busy making cheap shots about the Deep South!").
* WhoNeedsTheirWholeBody: Certainly not Cassandra.
* TheXOfY: "The End of the World".

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