Two years after the war with the griffins, peace and harmony once again returned to Equestria. But, from the shadows of the past, a new enemy emerges…  
Descendants of ponies, who were long ago exiled from Equestria by Princess Celestia for their dangerous behaviour and experiments, seek to return to the land they used to call home. Over the years, their leader had amassed a great army and gained powerful allies. She decides to exact revenge on the one who exiled her… Princess Celestia realizes the threat and enacts a plan she started shortly after the end of The Equestrian War.  
When the conflict erupts and Equestria is attacked by initially unknown enemy, the Mirage squadron is once again sent to the skies, with Rainbow Dash leading them through countless perils. But will the Angels of Equestria be strong enough to stop another invasion of enemy forces? Or will they fail? Only time will tell…