Recap: Doctor Who NS S4 E5 "The Poison Sky"
The Doctor: You might as well have worn a t-shirt saying "clone". ... Although, maybe not in front of Captain Jack.
So the world's going to shit 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 "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.
Rose very, very briefly shows up on a UNIT screen, screaming at the Doctor. He doesn't notice.
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, once again
, decides to sacrifice himself, but Rattigan takes his place and, in an Heroic Sacrifice
, blows up the whole Sontaran fleet with a Sontar-HA!
As The Doctor and Donna prepare to see Martha off, the TARDIS is involuntarily pulled away in time, to an unknown destination...
The white Flesh cloning technique will become important again in series 6
- Acting for Two: Martha, as herself and Not Herself.
- Anger Born of Worry: After the Doctor's near-sacrifice, Martha immediately hugs him. Donna whacks him on the arm, then hugs him.
- Armor Is Useless: The Sontaran's armor seems mostly decorative, as UNIT mows them down when their firearms are working again.
- Atmosphere Abuse
- Atomic Hate: No Russia, for some reason. Even though North Korea gets in on the action!
- Authority Equals Asskicking: Colonel Mace
- Badass Army: 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. Despite all their talk of discipline they fought as individual warriors, and once their advanced technology (a field that made brass-jacketed bullets unfireable) was got around, they were immediately cut down by UNIT's organized fire-teams. It's implied that they still could have easily destroyed Earth from orbit without much trouble, but on the ground UNIT was more than equal to the challenge.
- Played straight with UNIT, as once they find a way around the Sontaran's anti-gun field they proceed to mow down the Sontarans with ease.
- Big Damn Gunship: The USS Valiant, making a return appearance, accompanied by the necessary Rousing Speech.
- The Brigadier: Mace again; Sir Lethbridge-Stewart himself also gets a Shout-Out and is explained as being "stranded in Peru".
- The Doctor, who Donna can see and hear on a monitor, secretly communicates with her the same way he did with 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).
- When the Doctor puts on a gas mask, the first thing he says is "Are you my mummy?", which was the Madness Mantra of the gas mask zombies from "Empty Child" and "The Doctor Dances".
- The whole Brig-stranded-in-Peru thing harkens back to the classic run and the Sarah Jane Adventures, where it's a Running Gag for the Brig to be "stranded in Peru" with important things are happening with UNIT.
- Chekhov's Hammer
- Cloning Blues: Clone!Martha quickly falls into a downward spiral of it when real!Martha's awakening cuts off her life support.
- Colonel Badass: Colonel Mace proves he's one not only by inspiring UNIT to put some steel jacketed rounds in Sontaran heads, he himself double-taps Commander Skorr with a pistol.
- Continuity Nod
- "Are you my mummy?"
- Also the Valiant from the end of series 3. And Torchwood's Sunrider weapon from The Christmas Invasion.
- Curb-Stomp Battle: 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.
- Cutting the Knot: 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.
- Deadpan Snarker: Colonel Mace learns this (not saluting) is the best way to cope with the Doctor's constant snide comments.
- Defcon Five: Averted, the DEFCON status is used correctly.
- Doesn't Like Guns: The Doctor snatches Luke's gun out of his hand and throws it away without breaking his stride. "If I see one more gun..."
- Don't Make Me Destroy You: The Doctor puts his own life at risk to give the Sonatarans 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.
- Enemy Mine: The united nuclear response includes India, Pakistan, the USA, China and North Korea. (Oddly, not Russia.)
- Famous Last Words
- Failed Attempt at Drama: 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.
- Fate Worse than Death: Luke's fellow students clearly consider his proposed "utopia" to be this; not even threatening them at gunpoint gets them to sign on.
Luke: I designed a mating program. I planned the whole thing!
Student: Well then, shoot me. (She leaves, as do the others)
- Brilliant but unnoticeable:
Donna: (to Martha, who wears the Doctor's coat over her hospital-type gown) You know, that coat, sort of works.
Martha: Feel like a kid in my dad's clothes.
Donna: Oh, well if you're calling him dad you’re definitely getting over him.
- Also, for a fraction of a second, Rose Tyler appears on the screen of the TARDIS when the Doctor sends his message to the Sontarans.
- Fun with Acronyms and Recursive Acronym: Taken to its logical conclusion with ATMOS, which stands for "Atmospheric Omissions System". The final S has to come from System, or Rattigan's whining makes no sense. One would think "omissions" is a misspelling of "emissions", but it's actually a pun: the system takes the dangerous chemicals out of the car's emissions; it's an emission omission system. That's just the kind of joke somebody like Rattigan would think was clever.
- Gas Mask, Longcoat: The Doctor puts on a gas mask while his coat is on.
- Genius Breeding Act: Luke tells his fellow Teen Geniuses about the one he has planned. They don't respond enthusiastically.
- Genre Savvy
General Skaal: A general would be unwise to reveal his strategy to the opposing party.
- Glory Seeker: The Sontarans, who would rather get blown up than let the Doctor win.
- Gunship Rescue: "UNIT carrier ship Valiant reporting for duty, Doctor."
- Heel-Face Turn: Rattigan
- He Had a Name: "He wasn't "Greyhound 40", his name was Ross. Now listen to me, and GET THEM OUT OF THERE!"
- Heroic Sacrifice: Luke
- Honor Before Reason
Martha: Just send that thing up on its own. I don't know, put it on a delay.
Doctor: I can't.
Donna: Why not?
Doctor: I've gotta give them a choice.
- Hostile Terraforming: Weakened by their eternal war with another race of Scary Dogmatic Aliens, the Sontarans hatched an uncharacteristically circuitous plan to bathe the earth in gas which is poisonous to native life but nutritious to themselves, so that they can use it to spawn more soldiers.
- Humanity Ensues: The clone-Martha gives the real Martha some vital information after considering her fake memories while she dies.
- Idiot Ball: Donna. Possibly justified because she is alone in a dangerous situation (and thus may not be thinking as clearly).
Donna: (on phone to the Doctor, regarding the use of a door switch) But it's Sontaran-shaped, you need three fingers!
Doctor: ...You've got three fingers.
Donna: Oh yeah!
- Informed Ability: 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 Sontaran's blatant cheating (a field which prevented their weapons from firing, making them incapable of even fighting back) they absolutely curb-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.
Considering this was coming from a Technical Pacifist who views the word "soldier" as an insult and that Sontarans are obviously a Martyrdom Culture that believes War Is Glorious this actually may have been a bit of Fridge Brilliance.
- In Joke: When UNIT begins passing out gas masks, the Doctor dons his and asks the Colonel in charge "Are you my mummy?"
- Insufferable Genius: Luke Rattigan is revealed to be a Jerkass Woobie for why. 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 with his life to its logical conclusion and decides to atone for his error by doing a Taking You with Me to the Sontaran mothership.
- It Has Been an Honor: "Donna, thank you. For everything. Martha, you too. Oh, so many times. Luke, do something clever with your life."
- Just Between You and Me: Defied: "A general would be unwise to reveal his strategy to the opposing party."
- Leaning on the Fourth Wall: When the Doctor complains about being stuck on Earth like a human, he quickly apologizes. As he does that, he looks at the camera for long enough that this apology is more to the viewers than Martha.
- Mauve Shirt: Ross Jenkins ends up dead anyway.
- Monumental Damage: 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.
- Mythology Gag: Rattigan calls the planet he intends to colonize "Earth.2", similarly to how the Cybermen referred to themselves as "Human.2".
- Not Herself: 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?"
- Oh Crap: The Sontarans, when they see that Rattigan has replaced the Doctor.
- Out-Gambitted: The clone-Martha prevented UNIT from launching nuclear weapons at the Sontarans, only to discover that was just what the Doctor wanted, having immediately recognised her as a fake.
- Proud Warrior Race Guy
Skorr: (dying) Wonderful...
- Real Person Cameo: Newsreader and presenter Kirsty Wark.
- Redemption Equals Death: Luke Rattigan commits suicide, saves the Doctor, and destroys the aliens when he realizes how badly he screwed up.
- Red Sky, Take Warning
- Rousing Speech: Mace gets one of these. Rattigan's goes less well.
- Squick: In-universe, 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 breeding program for them. (What's worse is that you'd need about 200 people to repopulate humanity without a lot of incest, and there are nowhere near 200 students at Rattigan's academy.)
- When opening a Sontaran door which requires three fingers, Donna forms her hand into the Vulcan salute, and shouting an Alan Partridge-style "Back of the neck!".
- Also, the Valiant's death star laser.
- Shut Up, Kirk!: 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".
- Stuff Blowing Up: The Doctor lights the upper atmosphere on fire. Somehow this doesn't cause rampant worldwide destruction. If the crossed fingers and "Please, please..." muttering are any indicator, the Doctor wasn't sure it wouldn't destroy the Earth.
- Taking You with Me:
- Talking To Herself: Martha talks to her clone; she even calls her Martha.
- Tempting Fate: Martha really should have said her goodbyes and "I'm good here" stuff outside the TARDIS.
- World-Healing Wave: Setting the sky on fire.
- You Are Better Than You Think You Are: The Doctor to Donna when she thinks she can't be helpful.
- You Have Outlived Your Usefulness: The Sontarans execute the brainwashed human soldiers, and were planning to use Luke and his students as target practice.