Dean Cadance, now promoted to Principal of Crystal Prep-Academy, receives news regarding her long lost brother. Meanwhile, an evil Witch Doctor, also skilled in robotics and machinery, plans world domination that only the Starfleet humans can defeat, but not without the help of Human Twilight Sparkle, and Human Lightning Dawn. All this that takes place during the Cantelot Games

While Marinette Dupain-Cheng (Ladybug) and Future Alix Kubdel (Bunnyx) are fighting against Cat Blanc to fix the mistake that Marinette have made, the Supreme Kaioshin of Time Chronoa and Xeno Trunks gives Gustavo da Silva Mello "Gu 10" a mission given by Henry Emily and his friends at the Equestria Girls World.

There the Celestialsapiyan also meets a girl called Kuriko Akatsutsumi, the younger sister of Momoko Akatsutsumi, she tells him everything what really happened and tells the whole truth about this world, they join forces to put the end of this nightmare once and for all.

Sunset Shimmer is happy! Despite the various curve balls she'd been thrown, she and her friends were finally happy and content...which course means that Shit is about to hit the fan. Dark forces are at work, and soon both worlds will be in great danger, as a great evil returns...and so will magic...

Inspired by Comma Typer's Magical Curiosity story