Alien forces have begun a war for earth, but the allied forces of the world fight against them with Xcom. But they aren't ready for another alien visiter, Twilight Sparkle, newly crowned Princess of Equestria.
Crossover between XCOM: Enemy Unknown and MLP. Twilight appears on Earth, shortly after the alien war. How will she cope with being taken prisoner? How will XCOM cope with the single most powerful psion they've ever encountered?