| Kirk Alyn | ... | Insp. David Worth | |
| Rosemary La Planche | ... | Laura Keith | |
| Roy Barcroft | ... | Spade Gordon | |
| Carol Forman | ... | Nila | |
| James Dale | ... | Agent Steve Evans | |
| Bruce Edwards | ... | Prof. Paul Williams [Chs. 1-6] | |
| James Craven | ... | Prof. James Clayton [Chs. 1, 10-12] | |
| Tristram Coffin | ... | Frank Chambers [Ch. 8] | |
| Tom Steele | ... | Henchman Grey [Chs. 1-3] / Pilot Haskell [Chs. 4-5] / Henchman Larkin [Chs. 7-8] / Native #1[Ch. 11-12] | |
| Dale Van Sickel | ... | Henchman Mac / False Prof. Graves [Chs. 6-7] / Cave guard #1[Ch. 11] | |
| Jack O'Shea | ... | Ali [Chs. 1, 10-12] | |
| Marshall Reed | ... | Det. O'Hara [Ch. 9] | |
| Robert J. Wilke | ... | Zod, Pursuit Plane Pilot [Chs. 10-11] (as Bob Wilke) | |
| Robert St. Angelo | ... | Native #3 [Ch. 11] | |
| Dave Anderson | ... | Porter [Ch. 9] | |
| rest of cast listed alphabetically: | |||
| James Carlisle | ... | Prof. Elwood M. Graves [Ch. 6] (uncredited) | |
| John Daheim | ... | Cave Guard #2 [Ch.11] (uncredited) | |
| Art Dillard | ... | Native #2 [Chs. 11-12] (uncredited) | |
| George Douglas | ... | Courier (uncredited) | |
| Sol Gorss | ... | Digger #1 [Chs. 1, 11-12] (uncredited) | |
| Bert LeBaron | ... | Warehouse Thug [Chs. 1-2, 10] (uncredited) | |
| Carey Loftin | ... | Ambulance Thug [Ch. 3] (uncredited) | |
| Post Park | ... | Headquarters Thug [Ch. 9] (uncredited) | |
| Loren Riebe | ... | Digger #2 [Chs. 1, 11-12] (uncredited) | |
| David Sharpe | ... | Native #4 [Ch. 11] (uncredited) | |
| Duke Taylor | ... | Roadblock Thug [Ch. 5] / 6th Native [Ch. 11] (uncredited) | |
| Ken Terrell | ... | Museum Thug [Ch. 6] (uncredited) | |
| Bud Wolfe | ... | Chemical Company Thug [Ch. 4] (uncredited) | |
| Joe Yrigoyen | ... | Roadblock Thug [Ch. 5] / Native 5 [Ch. 11] (uncredited) | |
Directed by | |||
| Fred C. Brannon | |||
Writing credits | ||
| Royal K. Cole | (original screenplay) and | |
| Basil Dickey | (original screenplay) and | |
| William Lively | (original screenplay) and | |
| Sol Shor | (original screenplay) | |
Produced by | |||
| Franklin Adreon | .... | associate producer | |
Original Music by | |||
| Stanley Wilson | |||
Cinematography by | |||
| John MacBurnie | |||
Film Editing by | |||
| Cliff Bell Sr. | |||
| Sam Starr | |||
Art Direction by | |||
| Fred A. Ritter | |||
Set Decoration by | |||
| John McCarthy Jr. | |||
| James Redd | |||
Makeup Department | |||
| Bob Mark | .... | makeup supervisor | |
| Peggy Gray | .... | hair styles supervisor (uncredited) | |
Production Management | |||
| Roy Wade | .... | unit manager | |
Sound Department | |||
| Earl Crain Sr. | .... | sound | |
| Mandine Rogne | .... | sound effects (uncredited) | |
Special Effects by | |||
| Howard Lydecker | .... | special effects | |
| Theodore Lydecker | .... | special effects | |
Stunts | |||
| John Daheim | .... | stunt double: James Dale (uncredited) | |
| Bert LeBaron | .... | stunts (uncredited) | |
| Carey Loftin | .... | stunts (uncredited) | |
| David Sharpe | .... | stunts (uncredited) | |
| Tom Steele | .... | stunt double: Roy Barcroft, Tristram Coffin & Kirk Alyn (uncredited) | |
| Duke Taylor | .... | stunts (uncredited) | |
| Ken Terrell | .... | stunts (uncredited) | |
| Dale Van Sickel | .... | stunt double: Bruce Edwards & Kirk Alyn (uncredited) | |
| Bud Wolfe | .... | stunts (uncredited) | |
| Joe Yrigoyen | .... | stunts (uncredited) | |
Camera and Electrical Department | |||
| Bud Thackery | .... | process photographer (uncredited) | |
Costume and Wardrobe Department | |||
| Adele Palmer | .... | wardrobe supervisor | |
Music Department | |||
| Mort Glickman | .... | composer: stock music (uncredited) | |
| Ernest Gold | .... | composer: stock music (uncredited) | |
| Heinz Roemheld | .... | composer: stock music (uncredited) | |
| Marlin Skiles | .... | composer: stock music (uncredited) | |
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| The Black Widow | The Spider Returns | King of the Rocket Men | Dangers of the Canadian Mounted | Radar Patrol vs. Spy King |
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| Full cast and crew | Company credits | External reviews |
| IMDb Crime section | IMDb USA section |
The plot and action sequences of this serial are average for a latter-day Republic serial, but the nifty cast lifts it above the ordinary. Kirk "Superman" Alyn is very good in the action lead, Rosemary LaPlanche is fine as the heroine,and the dependable James Dale is a sturdy sidekick. In the villain's camp, the ubiquitous Roy Barcroft is superb, as always, and Carol Forman is menacing as the head of Underworld Inc., Nila. She also semi-reprises her role as The Spider Lady, in the Superman serial. Among the supporting cast are sometimes-serial lead Bruce Edwards (THE BLACK WIDOW), and James Craven. Marshal Reed and Tristam Coffin, who have both starred in other serials, have small parts as a police detective and a lawyer, respectively. As for the plot, which involves an Arab treasure, most of it is fairly standard stuff, but there is one unique (I think) twist that really comes as a surprise. This is a good serial, and Republic aficiandos should check it out.