Der Frosch mit der Maske

Joachim Fuchsberger

as Richard Gordon

Siegfried Lowitz

as (Ober-)Inspektor Elk (German version) /(Chief) Inspector Hedge (English version)

Eddi Arent

as James

Elfie von Kalckreuth

as Ella Bennet

Walter Wilz

as Ray Bennet

Carl Lange

as John Bennet

Dieter Eppler

as Joshua Broad

Jochen Brockmann

as Philo Johnson

Ernst Fritz Fürbringer

as Sir Archibald

Eva Pflug

as Lolita

Fritz Rasp

as Ezra Maitland

Erwin Strahl

as Sergeant Balder (German version) /Sergeant Barclay (English version)

Ulrich Beiger

as Everett

Michel Hildesheim

as Mills

Charlotte Scheier-Herold

as Lady Maggie Farnsworth (German version) /Lady Aubrid Farnsworth (English version)

Reinhard Kolldehoff

as Lew Brady

Benno Gellenbeck

as Inspector Ghent (voice) (uncredited)

Werner Hedman

as Inspektor Genter (German version) /Inspector Higgins (English version) (uncredited)

Günther Jerschke

as Voice of Newsreader on Radio (voice) (uncredited)

Holger Munk

as Sgt. Rubby (Sir Archibalds Vorzimmer-Sergeant) (uncredited)

Olaf Ussing

as Lord Charles Farnsworth (uncredited)

Carl Ottosen

as (uncredited)