History Recap / Supergirl2015S2E11TheMartianChronicles

* AbsenteeActor: Creator/MehcadBrooks, James Olsen, does not appear in this episode.

* BigDamnHeroes: After seemingly defeated, the second White Martian rises up again and prepares to strike at J'onn, but Alex enters the scene and shoots him down with [[ChekovsGun the gun she got from Slaver's Moon]].

* {{Irony}}: Kara feels the same kind of neglect Alex felt when she was hanging out with Superman.

* AlwaysChaoticEvil: {{Subverted}} with the White Martians. Not only thanks to M'gann herself, she also leaves Earth in the end to rally more open-minded individuals of her people against their racist society.

-->'''J'onn:''' ''(over the comms to Kara)'' We were wrong! There are two White Martians in the building.\\

'''Kara:''' ''(turns around nervously to face "Alex")'' ... Alex?\\
'''White Martian!Alex:''' ''(grinning sinisterly)'' You guys are so dumb. ''(growls and knocks Kara to the ground)''
* AnguishedDeclarationOfLove: J'onn gives one to M'gann before the battle with Armek and M'gann returns it to him before she leaves for Mars.
* ArmorPiercingResponse: When Kara once again tries to talk Winn out of the Guardian thing, he shuts her down quickly, saying that it is not just James, but also his calling.

-->'''Alex:''' ''(after shooting White Martian #2)'' Have I mentioned how much I love my new gun?
* BlatantLies: Despite her saying that it's okay, one can clearly see how upset Kara is about the fact that her sister wants to go to a concert with her girlfriend instead of coming to her Earth birthday.

** When everyone is placing their hands by the Bunsen burner flame to check who the white Martian is, Alex stares at the flame warily and stays far away from it, giving us a hint that she is a white Martian in disguise.

** Later, when Alex and Kara are searching the basement for Armek, Alex signals to Kara using some hand signals to look around the corner. Kara has no idea what those hand signals mean. But Alex would know her sister well enough to know that Kara doesn't know these hand signals; in fact, Alex has never used hand signals with Kara before, hinting that "Alex" here is actually a white Martian.
* FromBadToWorse: So if being trapped in the DEO with a shapeshifting killer alien isn't bad enough, how about said alien using Winn's access to mess with the building's reactor, setting it to explode, and take out a large chunk of National City along with it?

* ItsAllMyFault: M'gann is quick to blame herself for the danger she has placed J'onn, Kara and everyone at the DEO.

* LiteraryAllusionTitle: For Creator/RayBradbury's ''Literature/TheMartianChronicles''.

* MaritalRapeLicense: Not directly stated, but more than subtlety implied by M'gann in regards to her ArrangedMarriage with Armek.
* MoralMyopia: From the White Martians point of view, the Green Martians are monsters, and disguising yourself as one of them or helping them is akin to a war crime.

* ANaziByAnyOtherName: Armek proudly boasts how much of a paradise Mars is, now that the green "vermin" has been wiped out and is seemingly looking forward to do the same to humanity. M'gann wasn't exaggerating when she described him as the worst of the worst of her people.

* OutOfFocus: Given that the last episode ended with a wedge being formed between her and the men in her life, outside of Kara and Mon-El, and a brief scene between her and Winn, this episode focus more on J'onn and M'gann, and Kara's relationship with Alex.
* PutOnABus: Well, more like Spacecraft, M'gann decides to return to Mars to help bring back civility and peaceful revolution among other White Martians who think like her.

** The episode's title refers to [[Literature/TheMartianChronicles Ray Bradbury's classic novel/short story collection]].
* ShapeshifterGuiltTrip: The White Martian disguised as Alex stays in that form to fight Kara. When it lands its first blow on Kara, Kara hesitates, stunned for long enough that the white Martian teases her for being too afraid to fight.
* SpotTheImposter: J'onn uses fire from a Bunsen burner to expose the infiltrating White Martian among the DEO.

-->'''White Martian!Alex:''' What's wrong, Supergirl? Too afraid to put up a fight?

-->'''White Martian!Alex:''' To tell you the truth, I'm glad they found your sister. It's so exhausting pretending to care about your silly little feelings.\\

* WhamShot: M'gann and J'onn find Winn cocooned to the ceiling. Then they see another on a nearby wall and realize a second White Martian is impersonating Alex.

* YouAreACreditToYourRace: J'onn has fully gotten over his hatred against M'gann.

* ChekovsGun: A literal one. Alex uses the gun she called dibs on at Slaver's Moon to shoot the second White Martian right when he's about to strike J'onn.

'''J'onn:''' It’s Alex! The other White Martian has shape-shifted into Alex!\\

'''Kara:''' ''(turns around nervously to face "Alex")'' ...Alex?\\

** The whole setup of a shapeshifting alien in a locked down base is straight from ''Film/TheThing''.

M'gann fears that a White Martian named Armek, has come to drag her back to Mars, and while J'onn and Kara strive to protect her, they also face the frightening possibility that anyone in the DEO could be him in disguise.

* ChekovsGun: Alex uses the gun she called dibs on at Slaver's Moon to shoot the second White Martian right when he's about to strike J'onn.

* {{Foreshadowing}}: Alex is surprised when Kara says she only made plans for her Earth-birthday that morning, even though in the earlier scene she had clearly not heard the plans before, foreshadowing that it's really a White Martian disguised as Alex.