Melvyn Douglas as Jerome 'Jerry' Marvin

Ruth Hussey as Professor Susan Drake

Ellen Drew as Babe Marvin

Charles Coburn as Professor Drake

John Hubbard as Tom Drake

Harvey Stephens as Dr. Cassell

Theresa Harris as Hattie

Hooper Atchley as Ticket Man (uncredited)

Irving Bacon as Doorman (uncredited)

Brooks Benedict as Concert Attendee (uncredited)

George Beranger as Waiter (uncredited)

Betty Blythe as Minor Role (uncredited)

Lloyd Bridges as Taxi Driver (uncredited)

Barbara Brown as Shipboard Passenger (uncredited)

Hobart Cavanaugh as Shipboard Passenger (uncredited)

Grace Darmond as Minor Role (uncredited)

Thornton Edwards as Cuban Driver (uncredited)

Bob Evans as Black Man (uncredited)

Edward Fielding as Dr. Mandel (uncredited)

Martín Garralaga as Cuban Driver (uncredited)

Lawrence Grant as Dr. Holgarth (uncredited)

Chuck Hamilton as Sailor (uncredited)

Sam Harris as Concert Attendee (uncredited)

Arthur Stuart Hull as Shipboard Passenger (uncredited)

Crauford Kent as Dr. Jenkins - Ship's Doctor (uncredited)

Paul Lopez as Cuban Official (uncredited)

George McKay as Steward (uncredited)

Paul McVey as Minor Role (uncredited)

John Merton as Officer (uncredited)

Harold Miller as Shipboard Passenger (uncredited)

Forbes Murray as Minor Role (uncredited)

Pedro Regas as Cuban Driver (uncredited)

Addison Richards as Middle-Aged Man in Jerry's Stateroom (uncredited)

Cyril Ring as Shipboard Passenger (uncredited)

Ronald R. Rondell as Shipboard Passenger (uncredited)

Cosmo Sardo as Shipboard Passenger (uncredited)

Larry Steers as Departing Shipboard Passenger (uncredited)

Roland Varno as Steward (uncredited)

Juan Varro as Cuban Driver (uncredited)

Lloyd Whitlock as Customer (uncredited)

Isabel Withers as Middle-Aged Woman in Jerry's Stateroom (uncredited)

Frank Yaconelli as Hat Vender (uncredited)

Edward Biby as

John Holland as