Twilight Sparkle and her friends once again save equestria. but this time she gets a little more from the villain than she expected. fearing for equestria and not thinking straight Twilight ventures into the underworld to stop the evil at its source.

The Galactic civil war is coming to a close, the sith beaten back by Republic forces in battle after battle has taken its toll on the empire. A lone Destroyer "Invincible" commanded by a powerful if politically weak sith finds itself at the edge of space pursued by a Republic task force after an unsuccessful battle.