Maybe you remember the line “Klaatu berada nikto”
From such movies as Evil Dead 3: Army of Darkness, well this is where that famous phrase is from! This phrase was cooked up by Edmund North for the screenplay, as was all the alien language. The actual meaning is unknown, but has been theorized to mean many different things. The most heart-warming interpretation, is “There’s hope for Earth if the scientists can be reached.” The most literal is “I die, repair me, do not retaliate.” Both quotes taken from https://en.wikipedia.org/wiki/Klaatu_barada_nikto
The effects hold up pretty well on a modern era viewing and the acting is great! Michael Rennie is great, as the benevolent but stern alien visitor and the kid, Billy Gray, nails his gosh shucks demeanor with a Gee Whiz even I believe. One bit in the middle sounds like it was taken from Mr. Wizard! Can we go meet the scientist? Well, sure! Golly, that’d be swell Mr. (not actual dialog) The damsel, Patricia Neal, is equally swell, showing her concern for her son and yet her undeniable interest in this handsome stranger. Not to ruin it, but you almost want a little 80s movie cliche in the end with her character. A must-see film. The message of the movie is still extremely relevant and powerful. Mankind must give up its warlike ways, or face total annihilation, for the safety of the solar system and beyond. Specifically, nuclear annihilation. Science-driven, the movie sidesteps the political system in favor of a global scientific appeal to peaceful activities. 9 of ten: all scales. An arguably great movie.