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.
Commander John Maxon unexpectedly arrives in orbit above Equestria after a 90 year interstellar journey to Proxima Centauri in Cryostasis. John must learn to survive and inspire in an strange new world.