The cast of "Francis," in addition to Donald OConnor are Tony Curtis and Patricia Medina.
Donald Richey is 6'.
Donald Sinden 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 Quintana is 5' 10".
Donald Ramsey is 5' 9".
Donald Petrie is 6' 3".
Donald Redding is 5' 11".
Donald Redoglia is 5' 9".
Donald Paul is 6' 1".