Line #90 Recap/DoctorWhoS30E5ThePoisonSky


1	[[WMG:[[center:[-''[[Series/DoctorWho Doctor Who]]'' [[Recap/DoctorWho recap index]]\
2	'''Tenth Doctor Era'''\
3	'''Series 4:''' [[Recap/DoctorWho2007CSVoyageOfTheDamned CS]] \| [[Recap/DoctorWhoS30E1PartnersInCrime 1]] \| [[Recap/DoctorWhoS30E2TheFiresOfPompeii 2]] \| [[Recap/DoctorWhoS30E3PlanetOfTheOod 3]] \| [[Recap/DoctorWhoS30E4TheSontaranStratagem 4]] \| '''5''' \| [[Recap/DoctorWhoS30E6TheDoctorsDaughter 6]] \| [[Recap/DoctorWhoS30E7TheUnicornAndTheWasp 7]] \| [[Recap/DoctorWhoS30E8SilenceInTheLibrary 8]] \| [[Recap/DoctorWhoS30E9ForestOfTheDead 9]] \| [[Recap/DoctorWhoS30E10Midnight 10]] \| [[Recap/DoctorWhoS30E11TurnLeft 11]] \| [[Recap/DoctorWhoS30E12TheStolenEarth 12]] \| [[Recap/DoctorWhoS30E13JourneysEnd 13]]\
4	'''[[Recap/DoctorWho2006CSTheRunawayBride <<< Series 3]]''' \| '''[[Recap/DoctorWhoS30E14TheNextDoctor 2009 Specials >>>]]''']]-]]]
5	!The Poison Sky
6	[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/The_poison_sky_2783.jpg]]
7	[[caption-width-right:350:''[[Music/JeffersonAirplane Will you light the sky on fire?]]'']]
8	->Written by Helen Raynor\
9	Directed by Douglas Mackinnon\
10	'''Production code:''' 4.5\
11	'''Air date:''' 3 May 2008\
12	'''Part 2 of 2'''
13
14	->''"You might as well have worn a T-shirt saying 'clone'... Although, maybe not in front of Captain Jack."''
15	-->-- '''The Doctor'''
16
17	JustForFun/{{The one w\|ith}}here the Doctor has an in-joke with himself and Martha has a clone with a bald spot.
18	----
19
20	So the world's choking to death with Sontaran cloning gas spewing out of every car on the planet. UNIT gives the Doctor a gas mask (and ignores him when he quips [[Recap/DoctorWhoS27E9TheEmptyChild "Are you my mummy?"]]). He hangs out with obvious-clone-Martha for a bit, because even though she's working for the Sontarans she happens to be doing exactly what he wants her to do: stop UNIT from launching a nuclear attack.
21
22	Rose very, very briefly shows up on the [=TARDIS's=] monitor screen, screaming at the Doctor. Donna doesn't notice.
23
24	Luckily, the Doctor can whip up something that can burn all the gas, cleansing the air, using technology that has conveniently been developed by Rattigan's geniuses for when they were going to move to a new planet. He also, [[DeathSeeker once again]], decides to sacrifice himself, but Rattigan takes his place and, in a HeroicSacrifice, blows up the whole Sontaran fleet with a Sontar-HA!
25
26	As the Doctor and Donna prepare to see Martha off, the TARDIS abruptly takes off of her own volition, to an unknown destination...
27
28	Has a follow-up episode in the spin-off series ''Series/TheSarahJaneAdventures'' called "[[Recap/TheSarahJaneAdventuresS2E1E2TheLastSontaran The Last Sontaran]]".
29
30	----
31	!!Tropes:
32
33	* AlasPoorVillain: Martha clearly feels sorry for her dying clone, who really never had a chance for a life of her own.
34	* AngerBornOfWorry: After the Doctor's near-sacrifice, Martha immediately hugs him. Donna whacks him on the arm, ''then'' [[{{Tsundere}} hugs him]].
35	* ApocalypseHow: The Sontarans' AtmosphereAbuse threatens to at least cause a ApocalypseHow/Class2 that would force humanity to exist in specialised sealed environments (until the Sontarans eradicate the straggler pests from their new clone world, that is), and more than likely would actually cause an ApocalypseHow/Class5 for Earth's native life while the Sontarans come in and convert the planet's landscape into a breeding planet for themselves in the meantime.
36	* ArmourIsUseless: The Sontarans' armour, despite clearly looking bulkier than the standard UNIT armour, seems to be mostly decorative, as UNIT soldiers mow the Sontarans down when their firearms gain steel-cased bullets to avoid the Cordolaine signal. It might be that it's specifically designed to counter ''energy'' weapons, such as laser guns, in much the same way that Kevlar is specifically designed to stop bullets, not bladed weapons.
37	* ArtisticLicenseGunSafety: The Doctor throwing Luke's gun across the room is ''incredibly'' dangerous, basically guaranteeing a misfire. [[FridgeBrilliance That is, assuming the gun is even loaded.]][[invoked]]
38	* AtmosphereAbuse: The Doctor sets it on fire!
39	* AtomicHate: No Russia, for some reason. Even though ''North Korea'' gets in on the action!
40	* BadassArmy:
41	** Subverted. The Sontarans appear to be one of these until UNIT overcomes their weapons being disabled and gives them the ass-kicking of the century. The Doctor had just introduced them as the greatest soldiers in the universe, too.[[note]]Of course, this is the Doctor we're talking about, he was probably throwing a StealthInsult their way.[[/note]] Despite all their talk of discipline they fight as individual warriors, and once UNIT gets around their advanced technology (a field that makes copper-jacketed bullets unfireable), they're immediately cut down by UNIT's organized fire-teams. It's stated that they could have easily destroyed Earth from orbit without much trouble, but on the ground UNIT is more than equal to the challenge, especially since the Sontarans aren't expecting any resistance and allow themselves to be caught off-guard.
42	** Played straight with UNIT, as once they find a way around the Sontarans' anti-gun field they proceed to mow down the Sontarans with ease.
43	* BadGuysDoTheDirtyWork: The Sontarans correctly deduce that the Doctor is bluffing when he threatens to blow up their ship, reasoning that he doesn't have it in him to kill them all. As it turns out, Luke does.
44	* BigBad: General Staal, commander of the Sontaran forces at Earth.
45	* BizarreAlienSenses: The Doctor, apart from noticing various minor details about clone!Martha's appearance, can smell her being a clone.
46	* BlueAndOrangeMorality: Commander Skorr seems genuinely pleased that Colonel Mace had the honour to demand he turn around before putting a few bullets into him, and compliments him on his martial virtue as he lays on the ground, dying.
47	* TheBrigadier:
48	** Colonel Mace again carries on from the previous episode.
49	** Brigadier Sir Alistair Gordon Lethbridge-Stewart himself also gets a ShoutOut. The Doctor says that he wishes the Brigadier was here. Mace agrees, compliments him and says that he's "stranded in Peru".
50	* ChekhovsGun: Chekhov's Hammer, in this case — Donna uses the one the Doctor occasionally uses on the TARDIS console.
51	* {{Cliffhanger}}: As Martha's saying goodbye to the Doctor and Donna, the door slams shut and the TARDIS abruptly takes off of her own volition, startling everyone.
52	* ColonelBadass: Colonel Mace proves he's one not only by inspiring UNIT to put some steel-jacketed rounds in Sontaran heads, but he also double-taps Commander Skorr with a pistol — this after [[AsskickingLeadsToLeadership Skorr]] easily took down two UNIT soldiers armed with automatic rifles, and Mace intentionally sacrifices the advantage of coming up behind him to look him in the eye.
53	-->'''Colonel Mace:''' You will face me, sir!
54	* ContinuityNod:
55	** "[[Recap/DoctorWhoS27E9TheEmptyChild Are you my mummy?]]"[[note]]This line was apparently [[ThrowItIn improvised]] by Tennant after forgetting his original line.[[/note]]
56	** The ''Valiant'' returns from the [[Recap/DoctorWhoS29E13LastOfTheTimeLords end of series 3]].
57	*** And it's been fitted with Torchwood's Sunglider weapon from [[Recap/DoctorWho2005CSTheChristmasInvasion "The Christmas Invasion"]].
58	** The Doctor, who Donna can see and hear on a monitor, secretly communicates with her the same way he did with [[Recap/DoctorWhoS28E6TheAgeOfSteel Mickey in a previous episode]]. He gets her attention by saying "noble", while with Mickey he repeatedly used the word "idiot" (which is what he frequently called him).
59	** The whole Brig-stranded-in-Peru thing harkens back to the classic run and ''Series/TheSarahJaneAdventures'', where it's a RunningGag for the Brig to be "stranded in Geneva or Peru" when important things are happening with UNIT.
60	** Rattigan calls the planet he intends to colonize "Earth.2", similarly to how the Cybermen [[Recap/DoctorWhoS28E5RiseOfTheCybermen referred to themselves]] as "Human.2".
61	** The Doctor mentions [[Recap/DoctorWhoS29E11Utopia Captain]] [[Recap/TorchwoodS2E6Reset Jack]] to Martha's clone.
62	* CuttingTheKnot: While Donna and the Doctor try to fiddle with the car to unlock it, Donna's mother comes over and smashes the windscreen with an axe.
63	* DeadpanSnarker: Colonel Mace learns this (not saluting) is the best way to cope with the Doctor's constant snide comments.
64	* DeadlyGas: Downplayed — the gas is harmful, but not fatal until it reaches a very high density. This is a hint that it's not meant to be a weapon, but something else.
65	* DefconFive: Averted, the DEFCON status is used correctly. Nukes are ordered to be launched at Defcon 1.
66	* DoesntLikeGuns: The Doctor gets ''extremely'' fed up with the excessive gun usage in this two-parter, to the point where he snatches Luke's gun out of his hand and throws it away without breaking his stride.
67	-->'''The Doctor''': (enters the Rattigan Academy via transport, Donna and Martha in tow) Here. The Rattigan Academy, owned by- \
68	(Luke enters, aiming a gun)\
69	'''Luke''': (nervous) Don't tell anyone what I did. It wasn't my fault, the Sontarans lied to me, they- \
70	'''The Doctor''': ([[NoSell walks past Luke while taking his gun;]] infuriated) ''If I see one more gun...'' (tosses gun away)
71	* DontMakeMeDestroyYou: The Doctor puts his own life at risk to give the Sontarans a chance to walk away. They're far too egocentric to surrender and decide it'll be worth it if he gets blown up with them.
72	* EnemyMine: The united nuclear response includes India, Pakistan, the USA, China and North Korea. (Oddly, not Russia.)
73	* FailedAttemptAtDrama: The Doctor gives Donna her own [=TARDIS=] key, echoing Rose and Martha. "Quite a big moment, really." Donna suggests they celebrate after dealing with the poison gas.
74	* FateWorseThanDeath: Luke's fellow students clearly consider his proposed "utopia" to be this; not even threatening them at gunpoint gets them to sign on.
75	-->'''Luke:''' I designed a mating program. I planned the whole thing!\
76	'''Student:''' Well then, ''shoot me''. ''[she leaves, as do the others]''
77	* {{Foreshadowing}}:
78	** Brilliant but unnoticeable:
79	--->'''Donna:''' ''[to Martha, who's wearing the Doctor's coat over her hospital-type gown]'' You know, that coat ''sort'' of works.\
80	'''Martha:''' Feel like a kid in my dad's clothes.\
81	'''Donna:''' Oh, well if you're calling him dad you’re definitely getting over him.
82	** For a fraction of a second, Rose Tyler appears on the screen of the TARDIS when the Doctor sends his message to the Sontarans.
83	* ForeverWar: The Doctor reveals that the Sontaran-Rutan war has been going on for ''fifty thousand years''.
84	* FreezeFrameBonus: Rose Tyler can briefly be seen on the TARDIS's screen, yelling the Doctor's name, before it switches to the UNIT control room; the Doctor doesn't see it as he's looking away from the screen at that exact moment.
85	* FunWithAcronyms: ATMOS, again.
86	* GasMaskLongcoat: The Doctor puts on a gas mask while wearing his BadassLongcoat.
87	* GeniusBreedingAct: Luke tells his fellow {{Teen Genius}}es about the one he has planned. They don't respond enthusiastically.
88	* GlorySeeker: The Sontarans would rather get blown up than let the Doctor win. In fact, getting blown up ''with'' the Doctor is even better! What a glorious death that would be!
89	* GrammarNazi: Luke and the whole "'Atmos System' is redundant because the S stands for System" thing returns hilariously. When the Sontarans reveal that they'd have used Luke and his students as target practice once they'd outlived their usefulness, they don't actually make a priority of doing anything to the lone Luke... until he [[InsufferableGenius corrects them about that again]]. Then it's "EXECUTE HIM!"
90	* GunshipRescue: "UNIT carrier ship ''Valiant'' reporting for duty, Doctor." Despite his usual dislike of weapons and soldiers, the Doctor is genuinely impressed, and, before he catches himself, excited. Cue Colonel Mace's pointed remark.
91	-->'''Mace:''' [[DeadpanSnarker Having fun, Doctor?]]
92	* HeelFaceTurn: Rattigan rescues the Doctor from his own Heroic Suicide so he can finish off the Sontarans himself.
93	** Martha uses their shared memories to convince Clone Martha to betray the Sontarans and tell her the composition of their gas mixture. Unfortunately, with Martha disconnected the clone is dying, so this is her last act.
94	* HeHadAName: "He wasn't 'Greyhound 40', his name was Ross. Now listen to me, and [[SuddenlyShouting GET THEM OUT OF THERE]]!"
95	* HeroicSacrifice: Luke "does something clever" by swapping himself with the Doctor and blowing up the Sontarans and himself.
96	-->'''Luke:''' [[IronicEcho Sontar-HA!]]
97	* HeyYouHaymaker: Colonel Mace does this to Commander Skorr — with his gun.
98	-->'''Mace:''' You will face me, sir!
99	* HonourBeforeReason: Both the Doctor and Colonel Mace.
100	** Mace challenging [[AsskickingLeadsToLeadership Commander Skorr]] rather than just double-tapping him from behind. Since Mace is a ColonelBadass, he still puts Skorr down.
101	--->"You will face me, sir!"
102	** The Doctor's doesn't quite go as well.
103	--->'''Martha:''' Just send that thing up on its own. I don't know, put it on a delay!\
104	'''The Doctor:''' I can't.\
105	'''Donna:''' Why not?\
106	'''The Doctor:''' I've gotta give them a choice.
107	* HostileTerraforming: Weakened by their eternal war with another race of ScaryDogmaticAliens, the Sontarans hatch an uncharacteristically circuitous plan to bathe the Earth in an artificial, opaque gas which is poisonous to native life but nutritious to themselves, so they can kill off humanity while using the planet as a gigantic Sontaran cloning farm to spawn more soldiers.
108	* HyperAwareness: The Doctor can tell that the Martha shadowing him all episode is a clone because of "reduced iris contraction", and a "thinning of the hair follicles on the left temple".
109	* IdiotBall:
110	** Donna. [[JustifiedTrope Possibly justified]] because she is alone in a dangerous situation (and thus may not be thinking as clearly).
111	--->'''Donna:''' ''[on phone to the Doctor, regarding the use of a door switch]'' But it's Sontaran-shaped, you need three fingers!\
112	'''The Doctor:''' ... You've got three fingers.\
113	'''Donna:''' Oh yeah!
114	** Despite knowing about the Sontarans' gun-blocking signal, the Doctor doesn't tell the Colonel, resulting in Ross's untimely demise.
115	* InformedAbility: The Sontarans being the "universe's greatest soldiers" when their tactics appear to mostly consist of walking forward and shooting people. Sure they mopped the floor with the UNIT forces in the first encounter, but once the humans got past the Sontarans' ''blatant cheating'' (a field which prevented their weapons from firing, making them incapable of even fighting back) they absolutely [[CurbStompBattle kerb-stomped]] the "invincible" Sontarans. And unlike, say, Daleks with powerful shields, these guys get cut down by bullets pretty easily when their copper-expanding gimmick fails.
116	** Considering this is coming from a TechnicalPacifist who views the word "soldier" as an insult, and that Sontarans are obviously a MartyrdomCulture that believes WarIsGlorious, this actually may have been a bit of FridgeBrilliance. And it was stated several times throughout the episode that the Sontarans were holding back since they could have killed everyone easily, but needed the planet intact; and the Sontarans inside the factory were caught flat-footed, as they expected no resistance since the soldiers' weapons were disabled.[[invoked]]
117	* InsufferableGenius: Luke Rattigan is revealed to be a JerkassWoobie because of this. All he ever really wanted was to have some real friends who would praise him for his achievements, hence why he was so willing to work for the Sontarans, even hoping they'd adopt him into the fold, as it were. When they reveal he's disposable, he takes the Doctor's comment that he should do something clever with his life to its logical conclusion and decides to atone for his error by doing a TakingYouWithMe to the Sontaran mothership. [[invoked]]
118	* InTheBack: Colonel Mace {{defie\|dTrope}}s it, but only just. Coming up behind Commander Skorr during the UNIT counterattack, he bellows, "You will face me, sir!" and then puts three bullets in Skorr's chest the second he turns around.
119	* IntelligenceEqualsIsolation: Invoked by Rattigan, who argues that he and his fellow geniuses have spent their lives being excluded and laughed at by other people, and thus deserve to live more than "those cattle". Unfortunately for him, no one else thinks that way: his fellow students turn out to be quite well-adjusted and just want to find their parents. Rattigan is reduced to impotently ranting that this "proves" he's cleverer than them.
120	* ItHasBeenAnHonour: "Donna, thank you. For everything. Martha, you too. Oh, so many times. Luke, do something clever with your life."
121	* JustBetweenYouAndMe: Defied: "A general would be unwise to reveal his strategy to the opposing party."
122	* KerbStompBattle: The Sontarans find themselves on the receiving end of one this time once UNIT figures the Sontaran technology that stops their guns from firing. Once that happens, the aliens start getting mowed down.
123	* KickTheDog: When Donna and Sylvia talk on the phone, Donna tries to reassure her mother that people are working on the gas problem. Sylvia just snidely asks how she'd know that.
124	* KnowNothingKnowItAll: A rare instance of ''the Doctor'' being one of these; he furiously insists to Colonel Mace that "you ''[[PunctuatedForEmphasis can't! Fight! Sontarans!]]''", only for Mace to [[IgnoredExpert dismiss his concerns]] and give a RousingSpeech to his men while the Doctor rolls his eyes. Mace then entirely {{subvert\|edTrope}}s the expected [[GeneralFailure pointless and avoidable slaughter of his men in a futile attack]] when UNIT [[CurbStompBattle slaughter the overconfident Sontarans]], with Mace personally gunning down their ground commander, making the Doctor's warning come across as borderline hysterical.
125	* LeaningOnTheFourthWall: When the Doctor complains about being stuck on Earth like a human, he quickly apologizes. As he does that, he [[AsideGlance looks at the camera]] for long enough that this apology is more to the viewers than (evil) Martha.
126	* MartyrdomCulture: The Sontarans.
127	-->'''The Doctor:''' General Staal, you know what this is. But there's one more option: you can go. Just leave. Sontaran High Command need never know what happened here.\
128	'''Staal:''' Your stratagem would be wise if Sontarans feared death, but we do not.
129	** However, this doesn't stop them having an OhCrap moment when Luke replaces the Doctor — because they know that A) unlike the Doctor, he won't hesitate, and B) they've just lost the chance to take the Doctor down with them. Also, C) they could just be surprised that Luke of all people showed up.
130	* MauveShirt: After spending 1.5 episodes as the Doctor's {{sidekick}}, Ross Jenkins is killed in battle. This is why the Doctor doesn't like guns!
131	* MonumentalDamage: Though they aren't damaged, news reports show poison gas around the Hagia Sophia and the Sydney Opera House. Also, the ignition of the gas in the atmosphere sweeps over the Chrysler Building in New York.
132	* MoreExpendableThanYou: Luke sacrifices himself in place of the Doctor to blow up the Sontaran ship.
133	* MundaneSolution: When they find out the Sontaran technobabble field affects the copper in their bullet casings, UNIT just switches to steel-cased ammo and goes to town.
134	* MythologyGag:
135	** In New York, one of the buildings has a name reading "Butler Institute". The Butler Institute was a sinister EnigmaticInstitute in the ''Literature/DoctorWhoNewAdventures'' book ''Cat's Cradle: Warhead''.
136	** Donna spends a while pronouncing "Sontaran" incorrectly, but in the way that it was originally intended to be pronounced before Kevin Lindsay changed it in "[[Recap/DoctorWhoS11E1TheTimeWarrior The Time Warrior]]".
137	* NeverMyFault: Luke, pointing a gun at our heroes, demands they not tell anyone what he did. "It wasn't my fault, the Sontarans lied to me!" The Doctor snatches the gun and throws it away without slowing down.
138	* NewscasterCameo: Newsreader and presenter Kirsty Wark.
139	* NoEndorHolocaust: How the Doctor managed to ignite the lower level of the planet's atmosphere without frying or baking the people and living things on the planet underneath the global-scale explosion is anyone's guess. Or manages to avoid destroying it and/or the ozone layer.
140	* TheNoseKnows: Clone Martha apparently smells bad, but only the Doctor can tell.
141	* NotHerself: Martha. The Doctor suspects this almost immediately — one of the first things he asks the clone is if she's called her family. "No, what for?" Also, she smells.
142	* OfficerAndAGentleman: Colonel Mace, who on spotting Commander Skorr, barks "You will face me, sir!", and waits for him to turn [[CombatPragmatist (though only just)]] before shooting him.
143	* OhCrap: The Sontarans, when they see that Rattigan has replaced the Doctor.
144	* OutGambitted: The Martha clone prevents UNIT from launching nuclear weapons at the Sontarans, only to discover that's just what the Doctor wanted, having immediately recognized her as a fake. As the Doctor points out, she's essentially [[DoubleReverseQuadrupleAgent an unwitting triple-agent]].
145	* OutOfCharacterAlert: The clone of Martha has the original's memories, but not her concern for her family. She also misses the Doctor going "Avanti" instead of "allons-y", and gives off several other tells to an alien with HyperAwareness.
146	* PendulumWar: The conflict. At first UNIT is routed because the Sontarans have made their weapons inoperable. When UNIT brings in new bullets that aren't affected by the Sontaran technology, they return the favour.
147	* ProudWarriorRaceGuy:
148	-->'''Skorr:''' ''[dying]'' Wonderful...
149	* RankScalesWithAsskicking: Colonel Mace can kill a Sontaran — Commander Skorr, no less, who's an example in his own right — in one shot ''without'' using the back of the neck weakness. No one else can do this. Oh, and he warns the Sontaran of his presence.
150	-->"You will face me, sir!"
151	* RedSkyTakeWarning: This one is burning with a global fire.
152	* RedemptionEqualsDeath: Luke Rattigan [[HeroicSacrifice commits suicide, saves the Doctor, and destroys the aliens]] [[MyGodWhatHaveIDone when he realises how badly he screwed up]].
153	* RedshirtArmy: {{Zigzagged}} with the UNIT troops. Initially the Sontarans slaughter them with their [[EnergyWeapon laser guns]], because the troops are defenseless against them as the Sontarans' "[[{{Technobabble}} Cordolaine Signal]]" renders UNIT's firearms inoperable. As soon as Mace is informed of the bullet issues, they switch ammunition to steel casing bullets (which avoids the problem of copper bullet expansion blocking the barrel), after which, they then goes back in and they mop the floor with them, meaning the Sontarans become this.
154	* RousingSpeech:
155	** Mace gives one to his soldiers about how they're going show the aliens that they are ''not'' PunyEarthlings. The mocking laughter stops now! The result is a highly motivated fighting force.
156	** Rattigan attempts to give one to his Academy geniuses about how Earth doesn't appreciate them and how they can leave it behind to start again! The result is everyone walking out on him.
157	* ScrewThisImOuttaHere: Rattigan's students abandon him when he reveals his part in the Sontarans' invasion and his [[GeniusBreedingAct plans]] for how they can all survive on a new world.
158	* ShoutOut:
159	** When opening a Sontaran door which requires three fingers, Donna forms her hand into the [[Franchise/StarTrek Vulcan salute]].
160	** Shouting an Alan Partridge-style [[Franchise/AlanPartridge "Back of the neck!"]]
161	** The ''Valiant'''s [[Franchise/StarWars Death Star]]-esque laser.
162	* ShutUpKirk: A rare heroic example: "Thank you, Doctor, for your lack of faith, but unfortunately I've stopped listening." After two episodes of contempt and insults from the Doctor, whom he had treated with utter respect from the start, Colonel Mace finally stops listening and proceeds to prove the Doctor wrong and wipe the floor with the so-called "universe's greatest soldiers".
163	* SmoochOfVictory: Captain Price plants one on Colonel Mace when the wave of fire caused by the atmospheric converter passes to reveal a clean blue sky. They then get right back to business.
164	* SoldierVsWarrior: UNIT fights like soldiers in organized squads, the Sontarans fight like individual warriors — and UNIT are much more mobile. The Sontarans didn't stand a chance once their bullet-inhibiting field was disabled.
165	* {{Squick}}: InUniverse, as disgusted as Rattigan's fellow students are by his plan to destroy the Earth and move the school off-planet, what ends up making them leave is that he planned a ''[[GeniusBreedingAct mating program]]'' for them. (What's worse is that you'd need at least 200 people to repopulate humanity without a ''lot'' of incest, and there are nowhere ''near'' 200 students at Rattigan's academy. Bit of FridgeBrilliance there, since most likely at least one of the genii knows that).
166	* StuffBlowingUp: The Doctor lights the ''upper atmosphere'' on fire. If the crossed fingers and "Please, please..." muttering are any indicator, the Doctor [[NoEndorHolocaust wasn't sure it wouldn't destroy the Earth]].
167	* SwapTeleportation: Luke Rattigan pulls a RedemptionEqualsDeath by switching places with the Doctor using one of these, taking his place in the SuicideMission to stop the Sontarans. This is how he chooses to interpret the Doctor's parting instruction to "Do something clever with your life."
168	* TakingYouWithMe: The Sontarans consider their deaths acceptable if they get to take the Doctor down with them. They have five seconds to reconsider when Luke takes his place.
169	-->'''The Doctor:''' You'll die, Staal!\
170	'''Staal:''' Knowing that you die, too.
171	* TemptingFate: Martha really should have said her goodbyes and "I'm good here" stuff ''outside'' the TARDIS. In fairness, she had no way of knowing what would happen.
172	* TwinThreesomeFantasy: Discussed; the Doctor tells the Martha clone that she'd best not wear a T-shirt saying "Clone" in front of [[ExtremeOmnisexual Captain Jack Harkness]].
173	* UnderestimatingBadassery: Both the Sontarans and the Doctor underestimate U.N.I.T.. When the Colonel learns about the cordelane signal, he immediately grabs a solution in the form of steel bullets. When the Doctor points out they can't even see in the smog, he brings in the Valiant to clear the air. Suddenly the Sontarans have a real fight on their hands.
174	* UndressingTheUnconscious: The real Martha wakes up [[BarefootCaptives barefoot]] and wearing only a ModestyBedsheet, having been stripped of her clothes [[Recap/DoctorWhoS30E4TheSontaranStratagem in the previous episode]] to disguise her evil clone.
175	* UnwittingPawn: The Martha clone doesn't realize that the Doctor rumbled her a good while ago, but like the Sontarans he ''also'' wants her to keep cancelling the weapons launch. Furthermore, he deliberately tells Mace that he's going to use the TARDIS to get onboard the Sontaran ship within Clone Martha's hearing, leading her to thwart him by having the TARDIS teleported onto the ship while unbeknownst to her, Donna is onboard.
176	* WorldHealingWave: Setting the sky on fire to remove the poison.
177	* YouAreBetterThanYouThinkYouAre: The Doctor to Donna when she thinks she can't be helpful.
178	* YouHaveOutlivedYourUsefulness: The Sontarans execute the brainwashed human soldiers, and were planning to use Luke and his students as target practice.
179	* YouMustBeCold: The Doctor gives Martha his coat. It's a bit big for her, but Donna thinks it works.
180

Context Recap / DoctorWhoS30E5ThePoisonSky