The Cutie Mark Crusaders and their new member Dinky Doo have been assigned a group biography on a pony that was important to Equestrian history. The four quickly decide to do Captain Equestria, an old war hero in the first Changeling War that was given powers by the top secret Super Stallion Serum. When Queen Chrysalis and her husband King Cocoon come back for another war and the Changelings have secretly replaced many of Equestria's political figures and heroes including the Mane 6 with impostors. The Cutie Mark Crusaders (along with Rainbow Dash) must find the first and only trustworthy pony to help them fight a war that they have no idea who to trust... Captain Equestria!

Note: This isn't a Crossover but it is inspired by Marvel's Captain America and the Secret Invasion Marvel storyline. I repeat this isn't a crossover. Just inspired by the two.