Derpy comes across a stallion on a daily basis and without any information on him, other then that he's odd...it leaves her thinking it's just a coincidence . He remains a stranger, until one mail delivery that changes her outlook on the stallion and conjures a whole different, and stronger feeling.

The Doctor tells the Watcher the story of how he came to Equestria and why he ended up staying. How will this change the Watcher's view of the Timelord who killed her race?