| Milburn Stone | ... | Agent Tom Brant | |
| Jan Wiley | ... | Janet Lowe | |
| Dennis Moore | ... | Detective Lt. Jack Ryan | |
| Addison Richards | ... | Gerhard Doenitz, alias Garret Donahue | |
| Byron Foulger | ... | Prof. Elwood Henderson | |
| Maris Wrixon | ... | Dorothy Newton | |
| Sarah Padden | ... | Aggie | |
| George Lynn | ... | Herman, Chief Thug | |
| Russell Hicks | ... | Police Chief Michael J. O'Brien | |
| Roland Varno | ... | Arnold Hoffman aka Hoff, M-3 | |
| Lash La Rue | ... | Migsy (Street Urchin) (as Alfred La Rue) | |
| Jerry Shane | ... | Dan, Boys' Club Member | |
| Neyle Morrow | ... | Spike, Boys' Club Member (as Neyle Marx) | |
| John Eldredge | ... | Walter Stark, Council Member M-6 [Chs.1-5] | |
| rest of cast listed alphabetically: | |||
| Ernie Adams | ... | Flash Faust (uncredited) | |
| Richard Alexander | ... | Flamingo Club Bouncer (uncredited) | |
| Robert Barron | ... | M-5 (uncredited) | |
| Harris Berger | ... | Boys' Club Member (uncredited) | |
| Charles Blake | ... | Charter Plane Steward (uncredited) | |
| Walter Bonn | ... | Heifel (uncredited) | |
| George M. Carleton | ... | Jakob Braun aka Jake Brown, M-7 (uncredited) | |
| Horace B. Carpenter | ... | Man on Street (uncredited) | |
| George Chesebro | ... | Fireman Dragging Hose (uncredited) | |
| Jack Clifford | ... | Riverton Tower Switchman (uncredited) | |
| Edmund Cobb | ... | Riverton Railroad Official in Tower (uncredited) | |
| Kernan Cripps | ... | Apartment Thug (uncredited) | |
| Dick Curtis | ... | Reicher (uncredited) | |
| Sayre Dearing | ... | 2nd Nazi Lab Guard (uncredited) | |
| Joe Devlin | ... | Bauer (uncredited) | |
| Edward Earle | ... | Editor Phillips (uncredited) | |
| Matty Fain | ... | Slag Ritter (uncredited) | |
| Al Ferguson | ... | Truck Driver (uncredited) | |
| William Frambes | ... | Pat (uncredited) | |
| Dick French | ... | Schmidt (uncredited) | |
| John Gannon | ... | Charter Pilot (uncredited) | |
| Buddy Gorman | ... | Lug (uncredited) | |
| William Haade | ... | Abandoned Warehouse Thug (uncredited) | |
| Chuck Hamilton | ... | Guard in Hospital (uncredited) | |
| Richard Hirbe | ... | Johnny (uncredited) | |
| Margaret Hoffman | ... | Bay Street Landlady (uncredited) | |
| Edward Howard | ... | Pete Clark (uncredited) | |
| Kenneth Howell | ... | Boys' Club Member (uncredited) | |
| Arthur Loft | ... | M-1's Voice-Man (uncredited) | |
| Pierce Lyden | ... | Luther - Council Member M-9 (uncredited) | |
| Carl Mathews | ... | Henchman (uncredited) | |
| Charles McAvoy | ... | Policeman (uncredited) | |
| John Merton | ... | Vogel - Council Member M-10 (uncredited) | |
| George Offerman Jr. | ... | Boys' Club Extra (uncredited) | |
| Jack Perrin | ... | Policeman (uncredited) | |
| Jack Rockwell | ... | Safecracker (uncredited) | |
| Gene Roth | ... | Bat Logan (uncredited) | |
| David Sharpe | ... | Policeman (uncredited) | |
| Charles Sherlock | ... | Fingerprint Clerk (uncredited) | |
| Tom Steele | ... | Policeman / Henchman (uncredited) | |
| Robert R. Stephenson | ... | Bosch (uncredited) | |
| Ben Taggart | ... | Apartment Thug (uncredited) | |
| Joe Tarrell | ... | Okey (uncredited) | |
| Forrest Taylor | ... | Hospital Doctor (uncredited) | |
| Brooke Temple | ... | Mr. Butler (uncredited) | |
| Ken Terrell | ... | Henchman (uncredited) | |
| Dale Van Sickel | ... | Policeman in Loft Building (uncredited) | |
| Bud Wolfe | ... | Abandoned Loft Thug (uncredited) | |
| William Yetter Jr. | ... | Bill (uncredited) | |
| Clifton Young | ... | Loft Building Henchman (uncredited) | |
Directed by | |||
| Lewis D. Collins | |||
| Ray Taylor | |||
Writing credits | ||
| Jack Natteford | (original story) and | |
| Dwight V. Babcock | (original story) | |
| Joseph O'Donnell | (screenplay) and | |
| George H. Plympton | (screenplay) and | |
| Ande Lamb | (screenplay) | |
Produced by | |||
| Morgan Cox | .... | producer (as Morgan B. Cox) | |
Cinematography by | |||
| Maury Gertsman | (photography) | ||
| William A. Sickner | (photography) (as William Sickner) | ||
Film Editing by | |||
| Irving Birnbaum | |||
| Jack Dolan | |||
| Ace Herman | |||
| Alvin Todd | |||
| Edgar Zane | |||
Art Direction by | |||
| Harold H. MacArthur | (as Harold MacArthur) | ||
Stunts | |||
| Chuck Hamilton | .... | stunts (uncredited) | |
| Carl Mathews | .... | stunts (uncredited) | |
| David Sharpe | .... | stunts (uncredited) | |
| Tom Steele | .... | stunt double (uncredited) | |
| Ken Terrell | .... | stunts (uncredited) | |
| Dale Van Sickel | .... | stunts (uncredited) | |
Editorial Department | |||
| Norman A. Cerf | .... | supervising editor | |
Music Department | |||
| Paul Dessau | .... | composer: stock music (uncredited) | |
| Charles Previn | .... | composer: stock music (uncredited) | |
| Hans J. Salter | .... | composer: stock music (uncredited) | |
| Paul Sawtell | .... | composer: stock music (uncredited) | |
| Frank Skinner | .... | composer: stock music (uncredited) | |
| Dimitri Tiomkin | .... | composer: stock music (uncredited) | |
Other crew | |||
| William Holland | .... | dialogue director | |
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| The Spider Returns | The Secret of Treasure Island | Federal Agents vs. Underworld, Inc. | The Black Widow | King of the Rocket Men |
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| Full cast and crew | Company credits | External reviews |
| IMDb Action section | IMDb USA section |
Elwood Henderson invents the Orotron, a large device which can extract various minerals and elements in their minute quantities from sea water. Nazi agents (the serial, released in 1945, is set in 1938) plan to use the Orotron in order to obtain enough gold to buy up key American industries for their own use and purpose. Henderson is also taken prisoner by the Nazis, since he has to manufacture the gas tubes in order to make the Orotron work, when the present ones wear out. Government agent Tom Brant, police detective Jack Ryan, and reporter Janet Lowe, team up to find Henderson and round up the agents responsible for his and the Orotron's disappearance, including the Master Key, the unknown head agent of the Nazis in the US. Very good script overcome some of the weak fights in the serial. Many of the cliffhangers are so-so, and at times just look like the writers put them in there from making the chapters run a reel extra. Stone, Moore, & Wiley are all believable as Brant, Ryan, and Lowe respectively. Addison is very villainous Donohue, second Nazi in command. LaRue is as good as he every would be as the leader of Lowe's teenage reporter friends, but Fougler has one of his better roles as Henderson. Great ending to the serial, one of the few that respects the intelligence of the viewer. Rating, based on serials, 8.