History NightmareFuel / DestroyAllHumans

* During "This Island Suburbia", Crypto opts to use the Jumbo Probe on an uncooperative Majestic agent. The agent's face [[NightmareFace face begins to drain and looks decomposed, outright turning grey in the remake]].
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* The intro to the second game shows Pox taunting a brain stem he's about to experiment on, implying that all the brains you've collected as DNA are still [[AndIMustScream perfectly alive and aware until Pox is done with them.]] Thank god for the KGB.

* The fate of Miss Rockwell in the mission "Earth Women Are Delicious". First, she gets hypnotized to run off into the woods with Crypto, her dialogue implying that she's fully aware of what's happening to her [[AndIMustScream but can't do anything to stop it]]. Crypto's dialogue (especially in the original version; the remake {{Bowdlerise}}d it somewhat, but not entirely) implies that some of the experiments performed on her are [[MarsNeedsWomen sexual in nature]] -- in other words, Crypto and Pox sexually assaulted her. The newspaper epilogue reveals that she survived and was dumped back on Earth, but got thrown in an [[BedlamHouse insane asylum]] afterwards. It only takes until the second level for Crypto to cross the MoralEventHorizon.
* In the remake of the first game, when Crypto has abducted the Majestic Agent his face begins to drain and go a corpse like grey.

* Oh boy, the Blisk, who are TheManBehindTheMan (the KGB) in the second game responsible for attempting to mutate people into aliens and building a superweapon intended to turn Earth into a waterlogged homeland for the martians themselves. Having been driven off Mars by the Furons many years ago, a few refugees crash-landed with their warship in Tunguska during 1908, which had believed for many years to be a meteor crash. Soon after, they managed to kickstart the 1918 communist revolution and took complete control of the USSR. It becomes worse when the BigBad, Milenkov, tells you that every Premier before him (namely Vladimir Lenin, Joseph Stalin, but not Leon Trotsky) were all leading Blisk members. They make Crypto look like a saint in comparison.

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/crypto.png]]

* It says something that the scariest parts of the series are its main protagonists. Take Crypto himself, a sadistic and genocidal nigh-unstoppable killing machine who is able to rip out the brain stems of humans, destroy entire towns and cities, and even manages to wipe out an entire government agency and alien race. Not to mention, he manages to become [[PresidentEvil President of the United States]] in the end of the first game. If not for the game's over-the-top tone, he'd be fucking terrifying.

* Oh boy, the Blisk, who are TheManBehindTheMan (the KGB) in the second game responsible for attempting to mutate people into aliens and building a superweapon intended to turn Earth into a waterlogged homeland for the martians themselves. Having been driven off Mars by the Furons many years ago, a few refugees crash-landed with their warship in Tunguska during 1908, which had believed for many years to be a meteor crash. Soon after, they managed to kickstart the 1918 communist revolution and took complete control of the USSR. It becomes worse when the BigBad, Milenkov, tells you that every Premier before him (namely Vladimir Lenin, Joseph Stalin, but not Leon Trotsky were all leading Blisk members. They make Crypto look like a saint in comparison.

* It says something that the scariest parts of the series are its main protagonists. Take Crypto himself, a sadistic and genocidal nigh-unstoppable killing machine who is able to rip out the brain stems of humans, destroy entire towns and cities, and even manages to wipe out an entire government agency and alien race. Not to mention, he manages to [[spoiler:become [[PresidentEvil President of the United States]] in the end of the first game]]. If not for the game's over-the-top tone, he'd be fucking terrifying.

* Oh boy, the Blisk, who are [[spoiler:TheManBehindTheMan (the KGB) in the second game responsible for attempting to mutate people into aliens and building a superweapon intended to turn Earth into a waterlogged homeland for the martians themselves. Having been driven off Mars by the Furons many years ago, a few refugees crash-landed with their warship in Tunguska during 1908, which had believed for many years to be a meteor crash. Soon after, they managed to kickstart the 1918 communist revolution and took complete control of the USSR]]. It becomes worse when the BigBad, [[spoiler:Milenkov]], tells you that every Premier before him (namely Vladimir Lenin, Joseph Stalin, but not Leon Trotsky were all [[spoiler:leading Blisk members]]. They make Crypto look like a saint in comparison.
* Tunguska, the fourth region of the game where most of the plotline pieces together, is creepy in itself. The area is constantly dark and devoid of anything but green smog, with Red Army soldiers and KGB agents constantly walking the streets and shooting dead possible trespassers to their own base, and [[spoiler:the gunfights between Blisk Mutants and security members]] on the streets. Not to mention how grimly fitting the music and the wolf howls in the area sounds.
* The fate of Sergei. [[spoiler: After [[BigBad Milenkov]] captures Natalya off-screen, he mentions infecting him with spores, and that's the last we ever hear of him. Even after Crypto saves Natalya, neither of them bother to save him (then again, Milenkov mentions that trying to cure him wouldn't work), [[AndIMustScream so he's left there to suffer from agony]] as most Blisk Mutants do.]]

* It says something that the scariest parts of the series are its main protagonists. Take Crypto himself, a nigh-unstoppable killing machine who is able to rip out the brain stems of humans, destroy entire towns and cities, and even manages to wipe out an entire government agency and alien race. Not to mention, he manages to [[spoiler:become [[PresidentEvil President of the United States]] in the end of the first game]]. If not for the game's over-the-top tone, he'd be fucking terrifying.
** His weapons, too. He's able to [[AnalProbing anal probe]] people into ripping their brains out and has a DisintegratorRay as one of his main arsenal. By ''Path of the Furon'', Crypto can summon underground monsters to eat unsuspecting people, cause a meteor shower to land, pause time, summon black holes with a pistol, and even cause a tornado with his saucer. Way more terrifying than it sounds epic.

* It says something that the scariest parts of the series are it's main protagonists. Take Crypto himself; a nigh unstoppable killing machine who is able to rip out the brain-stems of humans, destroy entire towns and cities, and even manages to wipe out an entire government agency and alien race. Not to mention, he manages to [[spoiler:become [[PresidentEvil President of the United States]] in the end of the first game]]. If not for the game's over the top tone, he'd be fucking terrifying.
** His weapons can count too - He's able to [[AnalProbing anal probe]] people into ripping their brains out and has a DisintegratorRay as one of his main arsenal. By Path of the Furon, Crypto can summon underground monsters to eat unsuspecting people, cause a meteor shower to land, pause time, summon black holes with a pistol, and even cause a tornado with his saucer. Way more terrifying than it sounds epic.

* The fate of Sergei - [[spoiler: After [[BigBad Milenkov]] captures Natalya off-screen, he mentions infecting him with spores, and that's the last we ever hear of him. Even after Crypto saves Natalya, neither of them bother to save him (then again, Milenkov mentions that trying to cure him wouldn't work), [[AndIMustScream so he's left there to suffer from agony]] as most Blisk Mutants do.]]