Warning: Sex tag just for Cloud Kicker's conversations about sex just to be safe. And teen for the Pony swearwords
A Pegasus Pony named Lightning Bolt is really a human. He lands right before Season 1 and learns everything about ponies before the show starts. He gets a job as a weather pony and makes some friends along with having Rainbow Dash as a boss. Determined as he is not to change the show's timeline, little things start changing and soon the fate of Equestria may very well rely on his actions alone.