Mandrake and his team attempt to prevent "The Wasp" from stealing and using a new Radium invention.
Warren Hull
as Mandrake the Magician
Doris Weston
as Betty Houston
Al Kikume
as Lothar
Rex Downing
as Tommy Houston
Edward Earle
as Dr. Andre Bennett
Forbes Murray
as Professor Houston
Kenneth MacDonald
as James Webster
Don Beddoe
as Frank Raymond
Dick Curtis
as Dorgan
John Tyrrell
as Dirk
Stanley Brown
as Green
Beatrice Curtis
as Rest Home Nurse
