<Tr> <Th> Actor </Th> <Td> Michael Rennie, Patricia Neal </Td> </Tr> <Tr> <Th> First used in </Th> <Td> The Day the Earth Stood Still </Td> </Tr> <P> "Klaatu barada nikto" is a phrase that originated in the 1951 science fiction film The Day the Earth Stood Still . The humanoid alien protagonist of the film, Klaatu (Michael Rennie), instructs Helen Benson (Patricia Neal) that if any harm befalls him, she must say the phrase to the robot Gort (Lockard Martin). In response Gort relents from destroying the Earth and resurrects Klaatu from death . </P> <P> Edmund H. North, who wrote The Day the Earth Stood Still, also created the alien language used in the film, including the phrase "Klaatu barada nikto". The official spelling of the phrase comes directly from the script (as shown in the above image) and provides insight as to its proper pronunciation . </P>

The day the earth stood still famous phrase