Boris Karloff as Dr. Henryk Savaard

Lorna Gray as Janet Savaard

Robert Wilcox as 'Scoop' Foley

Roger Pryor as District Attorney Drake

Don Beddoe as Lieutenant Shane

Ann Doran as Betty Crawford

Joe De Stefani as Dr. Stoddard

Charles Trowbridge as Judge Bowman

Byron Foulger as Lang

Dick Curtis as Jury Foreman Clifford Kearney

James Craig as Juror Watkins

John Tyrrell as Juror Sutton

George Anderson as Prison Warden (uncredited)

Stanley Blystone as Prison Guard (uncredited)

Sam Ash as Druggist (uncredited)

Harlan Briggs as Defense Attorney Parker (uncredited)

Stanley Brown as Bob Roberts (uncredited)

Flo Campbell as Housewife (uncredited)

John Dilson as King - City Editor (uncredited)

Carl Faulkner as Bailiff (uncredited)

Chuck Hamilton as Juror (uncredited)

Frank Jaquet as Cigar-Smoking Fat Juror (uncredited)

Kenner G. Kemp as Reporter (uncredited)

William Lally as Bailiff (uncredited)

Perc Launders as Bailiff (uncredited)

Larry Lund as Court Clerk (uncredited)

Ian Maclaren as Priest (uncredited)

Charles McAvoy as Prison Official (uncredited)

Charles Miller as Dr. Avery - Juror (uncredited)

Bert Moorhouse as Reporter (uncredited)

Franklin Parker as Second Reporter (uncredited)

Tom Quinn as Reporter (uncredited)

Bob Reeves as Juror (uncredited)

Walter Sande as Reporter at Typewriter (uncredited)

Robert Sterling as First Reporter (uncredited)

Edward Thomas as Butler (uncredited)

Cyril Thornton as Senior Butler (uncredited)