Ever since the battle against the Terran Empire in 2410, the Alliance has been on their feet lately, having recently formed a new branch in their forces known as the Universal Alliance, they have been keeping a watchful eye out for any and all intrusions that may be made into other realms. However, the job is proving difficult with the Temporal Cold War underway, dealing with the Na'kuhl marauders, Noye's growing Krenim army, and the recently revealed Sphere Builders have been quite some trouble over the past five months.

But one place in the multiverse has been left safe and sound so far, an old friend of Twilight Sparkle's, Sunset Shimmer, has grown worried over her friend's duties, due to her calls to Twilight having failed, she decides to call her former teacher in order to gain some knowledge about Twilight's absence. But what she is to hear will be something that she, along with her friends at Canterlot High, were woefully unprepared for.