Ninja
From Tardis Wiki, the free Doctor Who reference
Ninjas were assassins in medieval Japan. (AUDIO: The Jade Pyramid) The Third Doctor claimed to have trained as a ninja on Quinnis. (PROSE: The Devil Goblins from Neptune)
Cousin Dysgenia was told that ninjas were actually mythical and based on Noh theatre, but that made them the most powerful martial art practitioners. (PROSE: A Story of the Peace)
