Thing from Another World 1951

Wikipedia: "The Thing from Another World (often referred to as The Thing before its 1982 remake), is a 1951 science fiction film based on the 1938 novella "Who Goes There?" by John W. Campbell (writing under the pseudonym of "Don A. Stuart"). It tells the story of an Air Force crew and scientists at a remote Arctic research outpost who fight a malevolent plant-based alien being...The Thing is now considered by many to be one of the best films of 1951."

Full Length Movie