Lew Ayres as Oliver Duffy

Laraine Day as Edwina 'Eddie' Brown

Basil Rathbone as Cesar Ferrari / Dr. H. Santelle

Walter Kingsford as Dr. Cromwall

Miles Mander as Dr. Kurt Immelman

Charles D. Brown as Police Inspector Gallagher

Cliff Clark as Police Lieutenant Allison

James Flavin as Police Lieutenant Schaeffer

Russell Gleason as Ogilvie

William Tannen as Devlan

Mark Daniels as Haguey

Bert Roach as Krum

Russell Hicks as Dr. Chandley

Charles Wagenheim as Fred F. Bixley

Robert Homans as Officer O'Garrity

Iris Adrian as Babe Stanton (uncredited)

Margaret Bert as Mrs. Geversar (uncredited)

Sam Ash as Theater Stage Manager (uncredited)

Robert Bradford as Whistles 'Over the Rainbow' (uncredited)

Ralph Brooks as Dr. Shepherd (uncredited)

Milton Parsons as Jarvis J. Banhoff (uncredited)

Eddie Buzard as Tall Newsboy (uncredited)

Bobby Callahan as Small Newsboy (uncredited)

George M. Carleton as Meeting Chairman (uncredited)

Eddy Chandler as Bill (uncredited)

Mary Currier as Miss Hewitt (uncredited)

Leslie Denison as Paul (uncredited)

Roger Moore as Jim (uncredited)

Jules Cowles as Crazy Man at the Clinic (uncredited)

Ralph Dunn as Policeman Outside Clinic (uncredited)

William Lally as Police Sergeant (uncredited)

Dick Midgley as Police Driver (uncredited)

George Magrill as Policeman (uncredited)

Arthur Belasco as Fat Man (uncredited)

Byron Foulger as Bird Man (uncredited)

Jerry Maren as Small Boy (uncredited)

Frank Marlowe as Cabbie with Cat (uncredited)

George Ovey as Old Man with Telegram (uncredited)

Edna Holland as Clinic Nurse (uncredited)

Edwin Stanley as Hospital Doctor (uncredited)

Hooper Atchley as Ambulance Doctor (uncredited)

Eddie Parker as Ambulance Driver (uncredited)

Rand Brooks as Young Reporter (uncredited)

Ernie Alexander as Reporter (uncredited)

Jack Gardner as Reporter (uncredited)

James Millican as Reporter (uncredited)

Mahlon Hamilton as Reporter (uncredited)

Wally Cassell as Photographer (uncredited)

Lester Dorr as Photographer (uncredited)

Arthur O'Connell as Photographer (uncredited)

Lee Phelps as Police Telephone Operator (uncredited)

Frances Rafferty as Clinic Switchboard Operator (uncredited)

Edward Hearn as Citizen (uncredited)

Joe Yule as Citizen (uncredited)

King Baggot as Psychiatrist at Lecture (uncredited)

Brooks Benedict as Psychiatrist at Lecture (uncredited)

Frank McLure as Psychiatrist at Lecture (uncredited)

Harold Miller as Psychiatrist at Lecture (uncredited)

Cyril Ring as Psychiatrist at Lecture (uncredited)

Count Stefenelli as Psychiatrist at Lecture (uncredited)

Cliff Danielson as Hotel Clerk (uncredited)

Emmett Vogan as Hotel Manager (uncredited)

Frank Whitbeck as Trailer Announcer (Voice) (uncredited)

Ray Teal as Police Car #12 Driver (uncredited)

David Tihmar as Dance Teacher (uncredited)