It's been 8 months since I got Nighty pregnant and turned into a bat pony, so me and Nightmare decided to stay together to conceive and raise the foal.

Spartan-117 get's stuck in Equestria, with no possible way home.

A starfleet admiral along with his starship the USS Titan are sucked into equestria when they are called back to earth by an unknown wormhole.

It's Nightmare Night, Nightmare Moon decides to have fun.