It's a Wonderful Life (1946)

George Bailey has so many problems he is thinking about ending it all – and it’s Christmas! As the angels discuss George, we see his life in flashback. As George is about to jump from a bridge, he ends up rescuing his guardian angel, Clarence – who then shows George what his town would have looked like if it hadn’t been for all his good deeds over the years.
Featuring James Stewart as George Bailey, Donna Reed as Mary Hatch, Lionel Barrymore as Mr. Potter, and Thomas Mitchell as Uncle Billy
Directed by Frank Capra