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."