When Equestria is being threatened by another return from both Sombra and Chrysalis, Twilight has no hope besides an odd collection of ponies called "The Outsiders".
When Magic and Bowser fall into a portal, which drops them into Equestria,they meet Fury, a changebat lich. as they adventure to find Fury's friends, no one knows what will happen, and why Magic and Bowser can't go home.