Which 1951 science-fiction film features the famous phrase "Klaatu barada nikto"?

Which 1951 film starred Gregory Peck and Susan Hayward? Which 1951 Hank Williams classic asks "What ya got cookin'?" in its chorus? Which 1951 film ends with the line "I have always depended on the kindness of strangers"? James Arness played the alien title creature in which 1951 science-fiction film? In which 1951 film does a missionary's sister tell her boat captain, "Nature, Mr. Allnut, is what we are put in this wo… Gene Kelly plays an ex-GI painter on Paris's Left Bank in which 1951 Best Picture winner? Which country produced the 1951 film "Rashomon"? 1951 saw the first electric power ever generated from which source?