Universal cowboy star Rod Cameron plays Geoffrey, conductor of a high-toned symphony orchestra. Secretly harboring the desire to become a swingin' jazz trumpeter, Geoffrey takes a job at a "hot" Broadway nightclub. Here he meets and falls in love with café songstress Donna (Frances Raeburn), who has led her family to believe that she's studying for a classical-music career. Meanwhile, a comedy-relief romance develops between Geoffrey's snooty valet Chumley (Arthur Treacher) and Donna's best pal Pat (Jacqueline De Wit). For those not interested in the plot (what there is of it), Swing Out, Sister includes specialty numbers by organist Selika Pettiford and the Lou Diamond Quintet.
Rod Cameron
as Geoffrey Cabot
Billie Burke
as Jessica Mariman
Arthur Treacher
as Chumley
Frances Raeburn
as Penelope Mariman / Donna Leslie
Jacqueline deWit
as Pat Cameron
Samuel S. Hinds
as Rufus Mariman
Fuzzy Knight
as Clutch
Milburn Stone
as Tim Colby
Edgar Dearing
as Motorcycle Cop
Sam Flint
as Mr. Bradstreet
Constance Purdy
as Mrs. Bradstreet
Leo Diamond
as Leo Diamond
