Following a fierce firefight with the Rebellion, Galen Marek aka Lord Starkiller is marooned on the world of Equis, where he founds the Espada Order and trains the Mane 6 in the ways of the Force.
Luke Skywalker has landed at an unexplored planet when his cruiser was destroyed by the empire. The rebel alliance will now team up with talking ponies to stop Darth Vader from taking over Equestria.
Darth Vader, one of the most insidious villains in the entire galaxy, ends up in Equestria of all places. With no support from the Empire, this Sith Lord needs to find a way off the planet. Or he could take over it. Either one works.