A post-apocalyptic story about a single human stubbornly staying on an island, and robot ponies trying to convince him to emigrate to a digital Equestria. Inspired by Friendship is Optimal.
In the far future, Princess Twilight proposes a grand scale project to resolve Equestria's looming energy crisis once and for all. Two retired princesses have some personal issues with this.
Lightning Dust strands her rocket in space. She'll die unless Equestria's Best and Brightest find a way to bring her home despite sabotage, snobbery, limited resources, and bureacratic incompetence.
Pony Wallflower Blush wakes up in a desolate and empty world, hoofcuffed to a princess of a species she's never heard of before. Everything feels so wrong. She tries not to think about it too hard.
After the two groups meet up due to circumstances, Sonic and the Equestria Girls must team up to defeat an evil genius, who wants to use his power for world domination, while on the run from the government lead by a special agent.