Humanity's space exploration ultimately took the form of billions of identical probes, capable of building anything (including astronauts themselves) upon arrival at their destinations. One lands in Equestria. Things go downhill from there.
Equestria hates fighting, so what happens when a foal is born with a special talent for it? For Fire Fight, a grand adventure across the lands will ensue. One that will open everypony's eyes, and show him the true meaning of who he is.
Twilight sets out to learn more of the ways of the world, and soon decides that the whole planet is disorganized, insanely dangerous, and desperately needs to be fixed. And she's just the mare to do it... with a little help from her friends.
Clinging to Celestia's teachings of mercy and forgiveness, Twilight journeys south across the sand sea to make peace with the enemy who devastated her homeland. But every step of the way, the brother they killed is there to haunt her.
A thousand years ago, the three pony tribes failed to form a unified nation, and war doomed the unicorns to near-extinction. Twilight and Applejack now seek the Elements in the hopes of ending the long conflict between pegasi and earth ponies.
Years ago, Daring Do discovered an ancient city, and a strange lock she couldn't open alone. A while ago she met Rainbow Dash. Now it's time to go back and uncover the secrets she once had to abandon.
Princess Luna disappears from Equestria with hopes of saving the world and is accompanied by the enigmatic Sombra. Meanwhile, Celestia tries to bury secrets as immortal as she is and Cadance must choose her loyalties carefully...