Sailormoon-Harry Potter-Slayers TRY - Crossover: What can possibly go wrong with a Saeance?
How can a single Patronus, cast by a wizard so young he shouldn't be able to cast one at all, be powerful enough to drive off a hundred Dementors? A theory takes Harry on a journey halfway around the world. Post-3rd year, no pairings yet, Sailor Moon English DIC dub.
A desperate wizards failed gamble causes two worlds to collide and neither will be the same.