In response to the alien invasion of Earth, the Council of Nations agreed to activate the XCOM project, the planet's best chance for defeating the invaders. XCOM initially struggled to win any engagements with the alien forces, but after a few months, it appeared as if it might have a chance of succeeding in its mission. Then the aliens sent a battleship to take out the world's major cities in an attempt to cause widespread panic, which would lower XCOM's funding to the point that it wouldn't be able to sustain itself. A desperate assault on the UFO ends in the loss of XCOM's best squad, severely weakening the organization. The soldiers didn't die, though, nor did they destroy the alien craft. Instead, the battleship was sent on a course for a completely different planet. The UFO crash lands in Equestria, where the squad finds familiar invaders threatening a not-so-familiar population. Now they must do their best to assist the world's resident ponies, as they are the only chance the humans have of getting home in time to save their planet. However, the aliens' warfare may push both worlds to extremes that will leave them permanently scarred.