On the 2023rd year of the reign of the Royal Pony Sisters, a fleet of ships from the alien alliance known as "The Covenant" attacked Equestria. While the orbital defense grid and its crew fought valiantly, one cruiser managed to evade and is now hovering over the mega-city of New Manebasa. Reports so far indicate major damage and heavy casualties. While the last Spartan-II in service has been reported to be assisting the battle, the ENSC has organized Teams of Orbital Drop Shock Ponies, or ODSP to land on the carrier and capture or destroy it. Gunnery Sergeant Rainbow Dash has recruited four of her friends to help with the assault. If all goes well, this should be an easy mission...

Crossover with Halo 3 ODST, which is owned by Bungie.

For anyone who wishes to see all of Sadie's story since I'm skipping most of it, you can watch them all here.

August 22: Added title pun because why not.