The cast of "Francis," in addition to Donald OConnor are Tony Curtis and Patricia Medina.
Donald Sinden is 6'.
Donald Richey is 6'.
Gene Kelly dances by himself in the actual song "Singin' in the Rain", however, throughout the movie Donald O'Connor dances with Gene Kelly to numerous songs.
Donald Rizzo is 5' 11".
Donald Roeser is 5' 2".
Donald Brashear is 6' 3".
Donald Barton is 6' 3".
Donald Curtis is 6' 4".
Donald Elson is 6' 1".
Karen Donald is 5' 6".
Nick Donald is 5' 11".