"Klaatu barada nikto" is a phrase originating in the 1951 science fiction film, The Day the Earth Stood Still. (It was also used in the movie Army of Darkness starring Bruce Campbell.) The humanoid alien protagonist of the film, Klaatu (Michael Rennie), instructed Helen Benson (Patricia Neal) that, were anything to happen to him she must say the phrase to the robot Gort (Lockard Martin). In response Gort relented from destroying the Earth and resurrected Klaatu from death.