"KLATU BARADA NIKTO" is what the alien guy tells the pretty girl to say to the deadly robot so the robot will bring the alien guy back to life instead of attacking or whatever the robot was going to do if the pretty girl didn't say it.

That is, unless I'm developing false memories.


Nope, you remember good. "KLATU" was the deadly robots name - "BARADA NIKTO" seemed to iclude, "don't kill, pick up the pretty girl (Patricia O'Neal, if I remember correctly) & put her in my saucer, I'm dead in a prison cell, come get me, bring me back to life, etc., etc., etc.")
Michael Rennie could say a lot with only 2 words!