''[[http://forums.spacebattles.com/threads/mare-genius.226331/ Mare]] [[http://www.fimfiction.net/story/32193/mare-genius Genius]]'' by Samarkand is a ''Webcomic/GirlGenius[=/=]WesternAnimation/MyLittlePonyFriendshipIsMagic'' crossover fanfic.

During the events of Canterlot Wedding, Discord's prison is temporarly weakened. Never one to waste such a chance, he reaches across dimensions to find an agent of chaos he could unleash upon Equestria. His spell finds Agatha Heterodyne, a heroic MadScientist and copies her mind into a new pony body. Unaware that she is not the real thing and blaming her predicament on her criminally insane mother, Agatha starts discovering Equestria, trying to make sense of this new world.

Compare and contrast the author's other work, ''Fanfic/SparkgateAgathaAndTheGraspOfTheSerpentGod''.

!This fanfic contains examples of the following:

* AliensSpeakingEnglish: played with. Equestrian is functionally identical to English but Agatha's first language is actually German. She does speak English but it takes her several scenes to get fully used to it.
* BawdySong: Something to do with platypi. Even Fluttershy joins in (to her lasting chagrin when she sobers up). Believed to be Discworld's ''The Hedgehog Song''.
* BroughtDownToBadass: Agatha's normal methods of solving problems are initially hampered by her pony form lacking hands. However, her Skifander fighting skills turn out to still be applicable.
* [[CantHoldHisLiquor Can't Hold Her Liquor]]: Fluttershy gets drunk from just sniffing the drink Applejack brought. Actually justified, as the drink is not only a GargleBlaster but partially magical.
* CarnivoreConfusion: Gilda is clearly a carnivore. Agatha impresses her immensly by eating most of a rabbit raw on a dare. Her herbivore stomach doesn't take it well. No comments are made on it later, when Agatha meets Angel (a mute but clearly sentient rabbit).
* ComicallyMissingThePoint: [[spoiler: When Celestia tries talking to Twilight about mating, it flies right over the purple unicorn's head.]]
* ForWantOfANail: Annoyed by Gilda's antics, Agatha tells her how a minor mean act (Moloch's brother stealing her locket) indirectly led to her foster parents getting torn to shreds before her eyes.
* HeroicBSOD: Fluttershy gets one when she remembers what she did at the wedding. Agatha keeps getting them whenever she encounters something that her mind cannot currently process.
* HowDoIShotWeb: Agatha spends several hours figuring out how to walk on four legs.
* [[HypercompetentSidekick Hypercompetent Minion]]: Spike is not only a walking index of the whole library but also accustomed to handling both Twilight's and Rarity's quirks. He also speaks Germane.
* InnocentFanserviceGirl: Inverted. The fact of everypony being naked initially goes over Agatha's head and she freaks out when it finally dawns on her - but nopony but her cares. (Except for Rarity, who despite a massive hangover, senses fashion-related distress from several houses away.)
* NakedPeopleAreFunny: Agatha freaks out when she notices nobody in Ponyville wears clothing.
* LimbSensationFascination: Like most newly-ponified fic characters, Agatha finds having a tail a bit weird.
* NoodleImplements: Twilight dissects the story Agatha had heard while working as a fortune-teller. She not only deduces that the author of the story must have been a biped, but adjusts the NoodleImplements involved to make it work for ponies.
* NotSoDifferent: Rarity's "creativity mode" turns out to be eerily similar to sparks' "madness place". Once they meet halfway with their ideas, they become instant best friends.
* RealityEnsues: [[spoiler: Pinkie trying to surprise the combat-trained Agatha with a Party Cannon gets exactly the counteroffensive reaction one would expect.]]
* RunningGag:
--> '''Agatha''': "Danke."[[note]]German for "Thank you"[[/note]]
--> '''Pony being addressed''': "Donkey? Where?"
* ShoutOut: to ''Literature/{{Discworld}}'' -- After Applejack brings several jars of her family's trademark GargleBlaster to the wedding, she and several of the girls end up singing the Hedgehog Song.
* SufficientlyAnalyzedMagic: It doesn't take Agatha long to figure that the locals blatantly disregard normal physics. Being a MadScientist she gets over it reasonably quickly. After all, magic is just another form of SCIENCE!
* SugarBowl: Repeatadly lampshaded by Agatha. Ultimately averted, as she learns of the Mane Six's heroic deeds and decides Equestria is not so safe after all.
* TwitchyEye: Rarity gets one when she realises that Agatha is a mechanic... working with grease and oil... Fortunately, it doesn't last long.
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