Siegfried Lowitz

Scotland Yard and an American millionaire playboy go on the hunt for a frog-masked criminal mastermind whose gang is terrorizing the city of London.

Evil mastermind Dr. Mabuse seeks Professor Erasmus' secret invention, a device that makes one invisible, but a murder brings authorities into the mix.

When a powerful and ruthless financier dies in a plane crash, a somewhat distubed scientist keeps the tycoon's brain alive in his laboratory.