Klaatu barada nicto.

The phrase "Klaatu barada nikto" originated in the 1951 science fiction film "The Day the Earth Stood Still." In the film, the humanoid alien Klaatu instructs Helen Benson that if any harm befalls him, she must say the phrase to his robot companion, Gort, to prevent the destruction of the Earth. The phrase has become a common sci-fi catchphrase and has been referenced in various media. Despite its status as a classic sci-fi reference, the exact translation of the phrase is unknown