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Changed line(s) 43 (click to see context) from:
* HeroicSacrifice: Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or two. Fewsham pulls one later by allowing the humans to overhear the Warriors' plans, knowing he'll be killed for it.
to:
* HeroicSacrifice: HeroicSacrifice:
** Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode ortwo. two.
** Fewsham pulls one later by allowing the humans to overhear the Warriors' plans, knowing he'll be killed for it.
** Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or
** Fewsham pulls one later by allowing the humans to overhear the Warriors' plans, knowing he'll be killed for it.
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Changed line(s) 43 (click to see context) from:
* HeroicSacrifice: Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or two.
to:
* HeroicSacrifice: Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or two. Fewsham pulls one later by allowing the humans to overhear the Warriors' plans, knowing he'll be killed for it.
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* TheQuisling: Fewsham seems poised to be this for the Ice Warriors, not only to save his skin but to avoid whatever fate the authorities might have ready for him back down on Earth for collaborating with the invaders. However, he [[EvenEvilHasStandards hits his limit]] when he realizes the aliens plan to cause TheEndOfTheWorldAsWeKnowIt and orchestrates an EngineeredPublicConfession that clues the humans into the Ice Warriors' plans--at the cost of [[HeroicSacrifice his own life.]]
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The one with killer soap.
to:
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Dewicked trope
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* KillEmAll: ''None'' of the people originally stationed at the T-Mat moonbase survive this serial. Phipps and Fewsham survive longer than the rest, but Phipps dies at the end of Part 4, and Fewsham dies in the middle of Part 5.
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* TheSmurfettePrinciple: Gia Kelly is the only the only speaking female guest character in this story, although there is an uncredited female extra with no lines as an Earth technician.
to:
* TheSmurfettePrinciple: Gia Kelly is the only the only speaking female guest character in this story, although there is an uncredited female extra with no lines as an Earth technician.
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* {{Cucoloris}}: The launch countdown is projected onto Gia's face.
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Moving Trivia entry to Trivia tab.
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* CallBack: When waking dazedly, the Doctor mentions Victoria Waterfield.
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Creator/WendyPadbury. She apologises profusely for it in the DVD commentary.
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Creator/WendyPadbury. She apologises profusely for it in the DVD commentary.
to:
* CallBack: When waking dazedly, the Doctor mentions Victoria Waterfield.
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Creator/WendyPadbury. She apologises profusely for it in the DVD commentary.Waterfield..
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Creator/WendyPadbury. She apologises profusely for it in the DVD commentary.
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The one with killer soap. Alternately, the one where Creator/WendyPadbury got paint on her new outfit.
to:
The one with killer soap. soap.
Alternately, the one where Creator/WendyPadbury got paint on her new outfit.
Alternately, the one where Creator/WendyPadbury got paint on her new outfit.
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Changed line(s) 8,9 (click to see context) from:
Written by Brian Hayles. This serial first aired January 25-March 1, 1969.
to:
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The one with killer soap. Alternately, the one where Wendy got paint on her new outfit.
to:
The one with killer soap. Alternately, the one where Wendy Creator/WendyPadbury got paint on her new outfit.
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* BigBad: Slaar, the leader of the Ice Warriors who take over the moon.
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Changed line(s) 56 (click to see context) from:
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later stories]] where he claims to shun violence.
to:
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later stories]] stories]][[invoked]] where he claims to shun violence.
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Added DiffLines:
Written by Brian Hayles. This serial first aired January 25-March 1, 1969.
Added DiffLines:
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* AbsenteeActor: The Doctor is unconscious for the duration of the fourth episode in order to give Creator/PatrickTroughton a holiday.
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* UnitConfusion: The Thermostat shows a temperature above 60 degrees ''Centigrade'' after being turned up by Zoe to incapacitate the Ice Warriors. It has the desired effect on them, but the humans show no ill-effects, not even breaking sweat. In reality, such a temperature would be lethal to humans.[[note]]At the time the serial was made, most of the British populace was much more familiar with the Fahrenheit scale, so the person responsible for the prop likely didn't realize they were showing such an extreme temperature.[[/note]]
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* TheSmurfettePrinciple: Gia Kelly is the only the only speaking female guest character in this story, although there is an uncredited female extra with no lines as an Earth technician.
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Removing ZC Es.
Deleted line(s) 45,46 (click to see context) :
* PlantAliens
* PortalNetwork
* PortalNetwork
Changed line(s) 62,64 (click to see context) from:
* TheXOfY
* {{Zeerust}}
* {{Zeerust}}
to:
* {{Zeerust}}
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The fungus isn't QUITE a man-eating plant; it merely feeds on oxygen.
Deleted line(s) 44 (click to see context) :
* ManEatingPlant: The killer Martian fungus.
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Changed line(s) 25 (click to see context) from:
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Wendy Padbury. She apologises profusely for it in the DVD commentary.
to:
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Wendy Padbury.Creator/WendyPadbury. She apologises profusely for it in the DVD commentary.
Changed line(s) 31 (click to see context) from:
* DoomedNewClothes: A behind-the-scenes example. Wendy Padbury liked her second costume (the leather trouser suit) so much that she bought it — and BBC bureaucracy required her to pay before the start of filming. Then, in the scene where Zoe has to crawl through a tunnel, the paint on the set turned out to be still wet.
to:
* DoomedNewClothes: A behind-the-scenes example. Wendy Padbury Creator/WendyPadbury liked her second costume (the leather trouser suit) so much that she bought it — and BBC bureaucracy required her to pay before the start of filming. Then, in the scene where Zoe has to crawl through a tunnel, the paint on the set turned out to be still wet.
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Renamed trope
Changed line(s) 26 (click to see context) from:
* {{Cukoloris}}: The launch countdown is projected onto Gia's face.
to:
* {{Cukoloris}}: {{Cucoloris}}: The launch countdown is projected onto Gia's face.
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Changed line(s) 20,21 (click to see context) from:
* ArtisticLicenseBiology: The seed pods emit the fungus. Fungi grow from spores, not seeds. Though to be fair, these things are from another planet. They could be called fungi because they look like it, not because they act like it.
* ArtisticLicenseChemistry: After trying various corrosive substances on a seed pod with no effect, the Doctor discovers that it's vulnerable to "ordinary water". But several of the things he tried before that were acids, which consist mostly of water.
* ArtisticLicenseChemistry: After trying various corrosive substances on a seed pod with no effect, the Doctor discovers that it's vulnerable to "ordinary water". But several of the things he tried before that were acids, which consist mostly of water.
to:
* ArtisticLicenseBiology: ArtisticLicenceBiology: The seed pods emit the fungus. Fungi grow from spores, not seeds. Though to be fair, these things are from another planet. They could be called fungi because they look like it, not because they act like it.
*ArtisticLicenseChemistry: ArtisticLicenceChemistry: After trying various corrosive substances on a seed pod with no effect, the Doctor discovers that it's vulnerable to "ordinary water". But several of the things he tried before that were acids, which consist mostly of water.
*
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Changed line(s) 62 (click to see context) from:
* WrenchWrench: Gia Kelly is the electronics-expert variant; she's the world's greatest expert on the planet-wide teleportation system, and also makes field repairs to an improvised DeathRay.
to:
* WrenchWrench: WrenchWench: Gia Kelly is the electronics-expert variant; she's the world's greatest expert on the planet-wide teleportation system, and also makes field repairs to an improvised DeathRay.
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Changed line(s) 51 (click to see context) from:
* StockFootage:
to:
* StockFootage:SpecialEditionTitle: The story title, episode number and writer are overlayed on a specially filmed model sequence, showing a scene of the Earth and Moon, with a music cue unique to this story.
* StockFootage:
* StockFootage:
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* WrenchWrench: Gia Kelly is the electronics-expert variant; she's the world's greatest expert on the planet-wide teleportation system, and also makes field repairs to an improvised DeathRay.
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Changed line(s) 35 (click to see context) from:
* FakeShemp: Creator/PatrickTroughton does not appear in episode four as he was on holiday during the week it was recorded. The Doctor is seen only as an unconscious figure, with Tom Laird doubling for Troughton with his face out of vision.
to:
* FakeShemp: Creator/PatrickTroughton does not appear in episode four Episode Four as he was on holiday during the week it was recorded. The Doctor is seen only as an unconscious figure, with Tom Laird doubling for Troughton with his face out of vision.
Changed line(s) 41 (click to see context) from:
* InfoDump: Zoe pushes a random button in the "Space Museum" and, boom, we get a two-minute rundown of the major technology of the episode.
to:
* InfoDump: Zoe pushes a random button in the "Space Museum" and, boom, we get a two-minute rundown of the major technology of the episode.story.
Changed line(s) 52,54 (click to see context) from:
** The footage of the rocket in episode five is stock footage of Mariner 4, a mission launched in 1964 to map the surface of Mars. Notably enough, the images taken by it were sufficient to dispel belief in intelligent life on the planet.
** The footage of the rocket launch in episode six is also library footage, from a Soviet launch in 1948 of a R-1 missile, a short-range copy of the German V-2.
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later episodes]] where he claims to shun violence.
** The footage of the rocket launch in episode six is also library footage, from a Soviet launch in 1948 of a R-1 missile, a short-range copy of the German V-2.
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later episodes]] where he claims to shun violence.
to:
** The footage of the rocket in episode five Episode Five is stock footage of Mariner 4, a mission launched in 1964 to map the surface of Mars. Notably enough, the images taken by it were sufficient to dispel belief in intelligent life on the planet.
** The footage of the rocket launch inepisode six Episode Six is also library footage, from a Soviet launch in 1948 of a R-1 missile, a short-range copy of the German V-2.
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with laterepisodes]] stories]] where he claims to shun violence.
** The footage of the rocket launch in
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later
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Added DiffLines:
* FakeShemp: Creator/PatrickTroughton does not appear in episode four as he was on holiday during the week it was recorded. The Doctor is seen only as an unconscious figure, with Tom Laird doubling for Troughton with his face out of vision.
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Hair Decorations is now a disambiguation, and these examples do not make it clear what trope to use
Deleted line(s) 37 (click to see context) :
* HairDecorations: Gia seems to think she's cuter with something that looks like a [[http://tardis.wikia.com/wiki/File:GiaKelly.jpg coffee cup]] attached to her hair.
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Added DiffLines:
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ice_leader_4766.jpg]]
[[caption-width-right:350:This is a far cry from those ice villains like your [[Film/BatmanAndRobin wisecracking]] [[Creator/ArnoldSchwarzenegger Schwarzenegger]].]]
->''"Your leader will be very angry if you kill me... I'm a genius!"''
-->-- '''The Doctor'''
The one with killer soap. Alternately, the one where Wendy got paint on her new outfit.
----
The TARDIS lands on 21st century Earth, and discovers that the T-Mat matter transportation system upon which the entire planet's economy now relies is broken. The Doctor and companions agree to take an elderly rocket to the Moon (which houses the relay station) and investigate.
When they arrive, they discover that Ice Warriors have taken over the station and are preparing to invade Earth. They have seed pods which will be T-Matted to selected points on the Earth's surface before emitting fungus that will remove oxygen from the atmosphere, killing all humans and rendering the planet habitable for the Ice Warriors.
The Doctor manages to get the T-Mat working and transports back to Earth, where he discovers that the seed pods are destroyed by contact with water (quite a big hole in the Ice Warriors' plan there). He uses the weather station on Earth to trigger a downpour, destroying all the seeds, then T-Mats back up to the moon to misdirect the approaching Martian fleet into orbiting the Sun, where they will be destroyed.
Not to be confused with [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]].
----
!!Tropes:
* AbsenteeActor: The Doctor is unconscious for the duration of the fourth episode in order to give Creator/PatrickTroughton a holiday.
* AlienKudzu: The Ice Warriors employ pods that release a rapidly-multiplying spore, which sucks the oxygen out of Earth's atmosphere. The Doctor finds out that ''water'' counteracts the pods.
* ArtisticLicenseBiology: The seed pods emit the fungus. Fungi grow from spores, not seeds. Though to be fair, these things are from another planet. They could be called fungi because they look like it, not because they act like it.
* ArtisticLicenseChemistry: After trying various corrosive substances on a seed pod with no effect, the Doctor discovers that it's vulnerable to "ordinary water". But several of the things he tried before that were acids, which consist mostly of water.
* BatmanGrabsAGun: The Doctor hunts and kills Ice Warriors with a heat ray.
* BreakOutTheMuseumPiece: The rocket. Later, a motor car, though we don't get to see that.
* CallBack: When waking dazedly, the Doctor mentions Victoria Waterfield.
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Wendy Padbury. She apologises profusely for it in the DVD commentary.
* {{Cukoloris}}: The launch countdown is projected onto Gia's face.
* CustomUniformOfSexy: All the male technicians wear hideous, baggy jumpsuits. Miss Kelly gets figure-hugging FutureSpandex.
* DestructionEqualsOffSwitch: Averted when an Ice Warrior pulls a bunch of levers on a (very simple) control panel and then shoots it, so it'd melt and nobody could change the setting. As the system is otherwise undamaged, the Doctor is able to rewire a new setting.
* DirtyCoward: Fewsham collaborates with the Ice Warriors, fearing for his life, until he sees he's helping wipe the human race out. Then he grows a pair and gives the secret to stopping the Ice Warriors at the cost of his life.
* TheDogBitesBack: Even a DirtyCoward can be pushed too far.
* DoomedNewClothes: A behind-the-scenes example. Wendy Padbury liked her second costume (the leather trouser suit) so much that she bought it — and BBC bureaucracy required her to pay before the start of filming. Then, in the scene where Zoe has to crawl through a tunnel, the paint on the set turned out to be still wet.
* DyingMomentOfAwesome: Fewsham, who is shot down after the Ice Warriors discover he is broadcasting their activities to an Earth station. Especially awesome because he'd been a Dirty Coward up until then.
-->'''Fewsham:''' Every word has been heard on Earth.
* EmotionlessGirl: Gia Kelly.
* FailedASpotCheck: An Ice Warrior completely misses Phipps while actively searching for him. All it had to do was turn around and that would've been that.
* GreaterScopeVillain: Grand Marshall is Slaar's boss but Slaar has a much heavier hand in the Ice Warrior plot.
* HairDecorations: Gia seems to think she's cuter with something that looks like a [[http://tardis.wikia.com/wiki/File:GiaKelly.jpg coffee cup]] attached to her hair.
* HeroicSacrifice: Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or two.
* HostileTerraforming: The Ice Warriors attempt to xenoform Earth using a fungus that will extract oxygen from the atmosphere.
* HurlItIntoTheSun: The humans send a signal from a communications satellite to draw the invading Ice Warriors off course into the sun.
* InfoDump: Zoe pushes a random button in the "Space Museum" and, boom, we get a two-minute rundown of the major technology of the episode.
* KillEmAll: ''None'' of the people originally stationed at the T-Mat moonbase survive this serial. Phipps and Fewsham survive longer than the rest, but Phipps dies at the end of Part 4, and Fewsham dies in the middle of Part 5.
* TheLivingDead: The spores' first victim not only breathes visibly, but his fingers twitch too.
* ManEatingPlant: The killer Martian fungus.
* MishmashMuseum: The TARDIS lands in a museum where displays about UsefulNotes/YuriGagarin, Creator/LeonardoDaVinci's flying machine, and a futuristic teleporter are all in the same room. On the other hand, this museum was pretty much the work of one person, who probably did have limited funding and space. Though it looks like a mishmash at first, it is explained that it is in fact a single exhibit about the history of transportation - which is what early flying machine designs, the first man in space, and a teleporter have in common that results in them being displayed together.
* PlantAliens
* PortalNetwork
* RedemptionEqualsDeath: Fewsham
* RightUnderTheirNoses: An Ice Warrior misses Jamie hiding in a corner, behind nothing at all.
* SequelEpisode: To "[[Recap/DoctorWhoS5E3TheIceWarriors The Ice Warriors]]".
* StockFootage:
** The footage of the rocket in episode five is stock footage of Mariner 4, a mission launched in 1964 to map the surface of Mars. Notably enough, the images taken by it were sufficient to dispel belief in intelligent life on the planet.
** The footage of the rocket launch in episode six is also library footage, from a Soviet launch in 1948 of a R-1 missile, a short-range copy of the German V-2.
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later episodes]] where he claims to shun violence.
* TranquilFury: The Doctor, having spent most of the serial clowning and panicking, is frighteningly calm and restrained as he explains to the BigBad what he has done, and why.
-->'''The Doctor:''' We sent up a satellite. That signal has sent your fleet into a false orbit.\\
'''Slaar:''' The heat of the sun will kill them! You have destroyed our entire fleet!\\
'''The Doctor:''' You tried to destroy an entire world.
* WeaksauceWeakness: If your species can be wiped out or your plans crippled by something like water, setting up shop on a world with a surface that's ~70% water is ill-advised.
* WeaponizedTeleportation: The Ice Warriors want to teleport the Doctor into outer space. Refusing do this is the beginning of Fewsham's HeelFaceTurn.
* TheXOfY
* {{Zeerust}}
----
[[caption-width-right:350:This is a far cry from those ice villains like your [[Film/BatmanAndRobin wisecracking]] [[Creator/ArnoldSchwarzenegger Schwarzenegger]].]]
->''"Your leader will be very angry if you kill me... I'm a genius!"''
-->-- '''The Doctor'''
The one with killer soap. Alternately, the one where Wendy got paint on her new outfit.
----
The TARDIS lands on 21st century Earth, and discovers that the T-Mat matter transportation system upon which the entire planet's economy now relies is broken. The Doctor and companions agree to take an elderly rocket to the Moon (which houses the relay station) and investigate.
When they arrive, they discover that Ice Warriors have taken over the station and are preparing to invade Earth. They have seed pods which will be T-Matted to selected points on the Earth's surface before emitting fungus that will remove oxygen from the atmosphere, killing all humans and rendering the planet habitable for the Ice Warriors.
The Doctor manages to get the T-Mat working and transports back to Earth, where he discovers that the seed pods are destroyed by contact with water (quite a big hole in the Ice Warriors' plan there). He uses the weather station on Earth to trigger a downpour, destroying all the seeds, then T-Mats back up to the moon to misdirect the approaching Martian fleet into orbiting the Sun, where they will be destroyed.
Not to be confused with [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]].
----
!!Tropes:
* AbsenteeActor: The Doctor is unconscious for the duration of the fourth episode in order to give Creator/PatrickTroughton a holiday.
* AlienKudzu: The Ice Warriors employ pods that release a rapidly-multiplying spore, which sucks the oxygen out of Earth's atmosphere. The Doctor finds out that ''water'' counteracts the pods.
* ArtisticLicenseBiology: The seed pods emit the fungus. Fungi grow from spores, not seeds. Though to be fair, these things are from another planet. They could be called fungi because they look like it, not because they act like it.
* ArtisticLicenseChemistry: After trying various corrosive substances on a seed pod with no effect, the Doctor discovers that it's vulnerable to "ordinary water". But several of the things he tried before that were acids, which consist mostly of water.
* BatmanGrabsAGun: The Doctor hunts and kills Ice Warriors with a heat ray.
* BreakOutTheMuseumPiece: The rocket. Later, a motor car, though we don't get to see that.
* CallBack: When waking dazedly, the Doctor mentions Victoria Waterfield.
* {{Corpsing}}: The sight of Creator/PatrickTroughton being swept off his feet by a wave of foam is too much for Wendy Padbury. She apologises profusely for it in the DVD commentary.
* {{Cukoloris}}: The launch countdown is projected onto Gia's face.
* CustomUniformOfSexy: All the male technicians wear hideous, baggy jumpsuits. Miss Kelly gets figure-hugging FutureSpandex.
* DestructionEqualsOffSwitch: Averted when an Ice Warrior pulls a bunch of levers on a (very simple) control panel and then shoots it, so it'd melt and nobody could change the setting. As the system is otherwise undamaged, the Doctor is able to rewire a new setting.
* DirtyCoward: Fewsham collaborates with the Ice Warriors, fearing for his life, until he sees he's helping wipe the human race out. Then he grows a pair and gives the secret to stopping the Ice Warriors at the cost of his life.
* TheDogBitesBack: Even a DirtyCoward can be pushed too far.
* DoomedNewClothes: A behind-the-scenes example. Wendy Padbury liked her second costume (the leather trouser suit) so much that she bought it — and BBC bureaucracy required her to pay before the start of filming. Then, in the scene where Zoe has to crawl through a tunnel, the paint on the set turned out to be still wet.
* DyingMomentOfAwesome: Fewsham, who is shot down after the Ice Warriors discover he is broadcasting their activities to an Earth station. Especially awesome because he'd been a Dirty Coward up until then.
-->'''Fewsham:''' Every word has been heard on Earth.
* EmotionlessGirl: Gia Kelly.
* FailedASpotCheck: An Ice Warrior completely misses Phipps while actively searching for him. All it had to do was turn around and that would've been that.
* GreaterScopeVillain: Grand Marshall is Slaar's boss but Slaar has a much heavier hand in the Ice Warrior plot.
* HairDecorations: Gia seems to think she's cuter with something that looks like a [[http://tardis.wikia.com/wiki/File:GiaKelly.jpg coffee cup]] attached to her hair.
* HeroicSacrifice: Early in the story, Osgood sabotages the moonbase's equipment while pretending to help the Ice Warriors. They kill him for it, but it serves to slow them down for a good episode or two.
* HostileTerraforming: The Ice Warriors attempt to xenoform Earth using a fungus that will extract oxygen from the atmosphere.
* HurlItIntoTheSun: The humans send a signal from a communications satellite to draw the invading Ice Warriors off course into the sun.
* InfoDump: Zoe pushes a random button in the "Space Museum" and, boom, we get a two-minute rundown of the major technology of the episode.
* KillEmAll: ''None'' of the people originally stationed at the T-Mat moonbase survive this serial. Phipps and Fewsham survive longer than the rest, but Phipps dies at the end of Part 4, and Fewsham dies in the middle of Part 5.
* TheLivingDead: The spores' first victim not only breathes visibly, but his fingers twitch too.
* ManEatingPlant: The killer Martian fungus.
* MishmashMuseum: The TARDIS lands in a museum where displays about UsefulNotes/YuriGagarin, Creator/LeonardoDaVinci's flying machine, and a futuristic teleporter are all in the same room. On the other hand, this museum was pretty much the work of one person, who probably did have limited funding and space. Though it looks like a mishmash at first, it is explained that it is in fact a single exhibit about the history of transportation - which is what early flying machine designs, the first man in space, and a teleporter have in common that results in them being displayed together.
* PlantAliens
* PortalNetwork
* RedemptionEqualsDeath: Fewsham
* RightUnderTheirNoses: An Ice Warrior misses Jamie hiding in a corner, behind nothing at all.
* SequelEpisode: To "[[Recap/DoctorWhoS5E3TheIceWarriors The Ice Warriors]]".
* StockFootage:
** The footage of the rocket in episode five is stock footage of Mariner 4, a mission launched in 1964 to map the surface of Mars. Notably enough, the images taken by it were sufficient to dispel belief in intelligent life on the planet.
** The footage of the rocket launch in episode six is also library footage, from a Soviet launch in 1948 of a R-1 missile, a short-range copy of the German V-2.
* TechnicalPacifist: The Doctor racks up quite a bodycount for someone who DoesNotLikeGuns and hates killing. He's saving humanity from genocidal invaders, but [[HarsherInHindsight this doesn't fit well with later episodes]] where he claims to shun violence.
* TranquilFury: The Doctor, having spent most of the serial clowning and panicking, is frighteningly calm and restrained as he explains to the BigBad what he has done, and why.
-->'''The Doctor:''' We sent up a satellite. That signal has sent your fleet into a false orbit.\\
'''Slaar:''' The heat of the sun will kill them! You have destroyed our entire fleet!\\
'''The Doctor:''' You tried to destroy an entire world.
* WeaksauceWeakness: If your species can be wiped out or your plans crippled by something like water, setting up shop on a world with a surface that's ~70% water is ill-advised.
* WeaponizedTeleportation: The Ice Warriors want to teleport the Doctor into outer space. Refusing do this is the beginning of Fewsham's HeelFaceTurn.
* TheXOfY
* {{Zeerust}}
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