The Master Key is a 1945 Universalmovie serial, directed by Lewis D. Collins and Ray Taylor. It starred Milburn Stone, Dennis Moore and Byron Foulger. This serial also featured the screen debut of future western film star Lash LaRue.
Plot
Nazi spies, led by the mysterious "Master Key", kidnap Professor Henderson in order to acquire his "Orotron machine" which is capable of extracting gold from sea water. FBI agent Tom Brant, aided by reporter Janet Lowe and Detective Lt. Jack Ryan, attempt to rescue him and crack the Nazi spy ring.