Casts
Derek Farr
as Ivan Mason / Dr. James Paxton
Ella Raines
as Rhona Ellison
Donald Wolfit
as Prof. Cattrell
Lisa Daniely
as Nurse Mitzi
Russell Napier
as Scotland Yard Supt. Davidson
Cyril Cusack
as Dr. Kelly
Frederick Piper
as Medwood Inspector Hayman
Karl Stepanek
as Dmitri Balinkev
John Welsh
as George White - the Gamekeeper
Olive Sloane
as Mrs. Lemmin - the Landlady
