​From Wikipedia, the free encyclopedia.   Michael Rennie (25 August 1909 – 10 June 1971) was an English film, television, and stage actor, perhaps best known for his starring role as the space visitor Klaatu in the 1951 classic science fiction film The Day the Earth Stood Still. Description above from the Wikipedia article  Michael Rennie  licensed under CC-BY-SA, full list of contributors on Wikipedia.