King Sombra returns with the help of a depressed Twilight Sparkle. But this time, he has his sights set on more than just the Crystal Empire.

A filly mysteriously appears at Twilight Sparkle's door, along with a stallion with a strange obsession towards her. But why is she there in the first place?

The New Lunar Republic attempts to recruit the Mane 6 and fight the massive airship army of the Solar Empire while dealing with the Splinter cell-like Celestia's Army.