The King of Terror is a BBC Books original novel written by Keith Topping and based on the long-running British science fiction television series Doctor Who. It features the Fifth Doctor, Tegan, Turlough, The Brigadier, and UNIT. The title may be a reference to a purported prophecy by Nostradamus predicting the arrival of a "King of Terror." Some scholars have argued the phrase is a misinterpretation of one French word for another, but nevertheless it remains in popular use.