The_Day_the_Earth_Stood_Still is quite an impressive movie for 1951.
https://en.wikipedia.org/wiki/The_Day_the_Earth_Stood_Still#Plot
https://en.wikipedia.org/wiki/The_Day_the_Earth_Stood_Still#Production
https://www.rottentomatoes.com/m/1005371-day_the_earth_stood_still
https://archive.org/details/day-the-earth-stood-still-1951
https://www.imdb.com/title/tt0043456 TDTESS
The Day the Earth Stood Still (2/5) Movie CLIP - Gort Appears (1951) https://www.youtube.com/watch?v=K6iF5sINVns Not liquid metal like in the T2 movie, but a flexible, yet very strong alloy.
