It is a truth universally acknowledged that there are only 20 employable British actors in the universe so they must appear in every British franchise ever released. Here's a nifty infographic that explains the overlaps between the casts of Harry Potter, Game of Thrones and Doctor Who. This will be extremely helpful next time you see an old white man with a fancy accent in a new series you're enjoying and find yourself saying, "WHERE do I know that guy???"

harry potter, game of thrones, doctor who