The Day The Earth Stood Still Wavs Michael Rennie as Klaatu: "It is no concern of ours how you run your own planet. But, if you threaten to extend your violence, this Earth of yours will be reduced to a burned-out cinder." Klaatu: "Klaatu Barada Niktoh." Klaatu: "Gort Maringa." Patricia Neal as Helen Benson: "Klaatu Barada Niktoh." Klaatu: "Your choice is simple - join us, and live in peace, or pursue your present course and face obliteration." Klaatu: "We shall be waiting for your answer."