The Law of Consonantal Shift was a principle that was developed by the Brothers Grimm. The law proposed that language changed over the course of centuries as words changed in a consistent fashion. The Fourth Doctor mentioned this to Romana II when discussing how the names of the Hydrax's officers, Miles Sharkey, Lauren MacMillan and Anthony O'Connor, had changed to Zargo, Camilla, and Aukon. (TV: State of Decay) The survey team and the technicians of the Mordee expedition later became the Sevateem and the Tesh. (TV: The Face of Evil)