Harry Potter, after a beating by Dudley and friends — with the help of a real gang member — wishes he had somewhere safe to go, and starts crawling home. He ends up in Equestria. The CMC find him. A year later, an owl brings his Hogwarts’ letter!
When one is in great need The Room of Requirement will provide the best solution... But maybe this one time, the wish fulfilled will turn out to be a curse.
In the final years of her imprisonment, Nightmare Moon was still plotting, but she wasn't returning alone. Behold, the Heir of the Moon! MLP/HP crossover