Twilight’s trip to Earth and friendship with the humans brings new friends and enemies to her peaceful world. With the specter of war hanging over them, Equestria will have to form an alliance like no other to fight the menace from the void.
An experianced XCOM squad is sent to Equetria, but they aren't the only ones. Humans will have to work with ponies if they want any hope of tracking down the escaped aliens, and more importantly, getting home.
(XCOM: Enemy Unknown/Within crossover) An XCOM squad ends up in Equestria after trying to disable an alien battleship, only to find that Earth isn't the only world under attack.