A 1957 science fiction in which all-powerful but highly moral aliens give five ordinary people the power to wipe out all HUMAN life on Earth, without damaging it in any other way (because the aliens are hoping for a new place to live), Starts out silly and gets sillier as it goes along. Apparently regarded as a classic, at least by those who value high-concept over common sense. Stars Gene Barry, the ORIGINAL Dr. Clayton Forrester. The trailer is here:

https://archive.org/details/The27thDayTrailer