Fandom(s): Doctor Who
Characters: Tenth Doctor, Donna Noble
Genre: Sci-fi, fantasy, adventure
Summary: Doctor Who/Harry Potter crossover: The Tenth Doctor and Donna fly through a crack in the walls of the universe and land in a world where humans can perform magic. Getting mixed up in the cold war between the Death Eaters, the Ministry of Magic, and the Order of the Phoenix, all sides want the Doctor dead!
Author's Note: This story is a crossover between Doctor Who and the Harry Potter universe.
Harry Potter: This happens during the summer after the events of Harry Potter and the Goblet of Fire. Plot/events and character personalities are from the novel and not the movie, though character physical descriptions are more or less from the movie and not the novel.
Doctor Who: This is sometime in series 4, after Donna has had a few adventures with the Doctor, but before "Midnight" and "Turn Left."
Slightly non-canonical, because this story assumes that the Harry Potter books do not exist in the Doctor Who universe, which explicitly goes against the episode "The Shakespeare Code."