Mister Big is a 1943 musical directed by Charles Lamont, starring Donald O'Connor, Gloria Jean and Peggy Ryan.
[1] This was the final of seven, successive B movie musicals that Universal Pictures cast with Donald O’Connor after he signed in 1941.
When his popularity soared prior to release, the studio added $50,000 in musical numbers and distributed it as an A.
The film had various working titles: Oh, Say, Can You Swing?, You Can't Ration Love and School for Jive.
Donald O'Connor was promoted to star billing for the film following the positive reception he had received at previews.