 The original German title referred to the successful TV series  _"Stahlnetz" (1958)_ (qv), which is based on the US police series  _"Dragnet" (1951)_ (qv) (it even used the famous "Dragnet" theme  song). The German theatrical trailer showed the actual title "Im  Stahlnetz des Dr. Mabuse", whereas the voiceover of the trailer  announces "Das Stahnetz des Dr. Mabuse" (which means "The steel  net..." instead of "In the steel net...").