From the 1951 film The Day the Earth Stood Still. An alien named Klaatu tells an earthwoman a code phrase for his robot Gort. See first citation.
"klaatu-barada-nikto." YourDictionary, n.d. Web. 06 December 2018. <https://www.yourdictionary.com/klaatu-barada-nikto>.
klaatu-barada-nikto. (n.d.). Retrieved December 06th, 2018, from https://www.yourdictionary.com/klaatu-barada-nikto
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