The Millionaire (1955)

John Beresford Tipton is a multi-billionaire, and among the things he does with his money is to give away $1 million to people he doesn't know. Every week Tipton, who is never seen, instructs his assistant, Michael Anthony, to deliver a check to to the person he chose--and ask each to sign an agreement to never tell anyone how s/he got the money. Also shown is how the recipients' lives are changed.