| Scott Kolk | ... | Agent Dexter (X-9) | |
| Jean Rogers | ... | Shara Graustark | |
| David Oliver | ... | Pidge | |
| Monte Blue | ... | Baron Michael Karsten | |
| Henry Brandon | ... | Blackstone | |
| Larry J. Blake | ... | Chief FBI Agent Wheeler (as Larry Blake) | |
| Henry Hunter | ... | FBI Agent Tommy Dawson (C-5) | |
| George Shelley | ... | Henchman Packard | |
| Lon Chaney Jr. | ... | Maroni (primary henchman) | |
| Si Jenks | ... | 'Jolly Roger' ticket barker [Chs. 1, 4, 7-9] | |
| Lynn Gilbert | ... | Rose, gang moll [Chs. 2, 6-7, 12] | |
| Robert Dalton | ... | Thurston | |
| Leonard Lord | ... | Ransom (dissident henchman) [Chs. 1-6] | |
| Ben Hewlett | ... | Scarlett (primary henchman) (as Bentley Hewlett) | |
| Bob Kortman | ... | 'Trader' Delaney [Chs. 7-9, 11-12] (as Robert Kortman) | |
| rest of cast listed alphabetically: | |||
| Thomas Carr | ... | FBI Agent Tracy - Phoney Newsboy [Chs. 3, 5, 7, 8] (uncredited) | |
| Jack Cheatham | ... | Henchman Sebastian [Chs. 8, 11-12] (uncredited) | |
| Al Ferguson | ... | FBI Agent Dyer [Chs. 1, 7] (uncredited) | |
| Max Hoffman Jr. | ... | Henchman Marker [Chs. 1-2] (uncredited) | |
| George Magrill | ... | Freighter Crewman [Chs. 9-10] (uncredited) | |
| Charles Murphy | ... | Jolly Roger Ticket-Taker (uncredited) | |
| Eddie Parker | ... | Marine Guard [Ch. 1] / FBI Agent Crain [Chs. 6-8, 11-12] / Henchman [Chs. 11-12] (uncredited) | |
| Edward Peil Sr. | ... | The Fence [Chs. 11-12] (uncredited) | |
| Elliott Rothe | ... | Agent Jimmie Tilden [Ch. 1] (uncredited) | |
| William Royle | ... | FBI Agent Dunn [Chs. 1, 2, 5-7, 10, 12] (uncredited) | |
| Tom Steele | ... | Policeman [Chs. 1-2] / Marine Guard [Ch. 1] / Henchman [Chs. 2, 5, 10] / FBI Agent [Chs. 7-8, 11] / 'Jolly Roger' sailor [Chs. 9, 11-12] (uncredited) | |
| Charles Sullivan | ... | Truck Driver [Ch. 4] (uncredited) | |
| Eddy Waller | ... | Lawyer Carp [Chs. 2, 12] (uncredited) | |
Directed by | |||
| Ford Beebe | |||
| Clifford Smith | (as Cliff Smith) | ||
Writing credits | ||
| Charles Flanders | (news feature) | |
| Wyndham Gittens | (story and screenplay) and | |
| Norman S. Hall | (story and screenplay) and | |
| Leslie Swabacker | (story and screenplay) and | |
| Ray Trampe | (story and screenplay) | |
| Dashiell Hammett | character (uncredited) | |
Produced by | |||
| Ben Koenig | .... | associate producer | |
| Barney A. Sarecky | .... | associate producer (as Barney Sarecky) | |
| Henry MacRae | .... | associate producer (uncredited) | |
Cinematography by | |||
| Richard Fryer | |||
| Jerome Ash | (uncredited) | ||
Film Editing by | |||
| Leete Renick Brown | (as L.R. Brown) | ||
| Joseph Gluck | (as Joe Gluck) | ||
| Louis Sackin | |||
| Alvin Todd | |||
Art Direction by | |||
| Ralph M. DeLacy | (as Ralph DeLacy) | ||
Stunts | |||
| George Magrill | .... | stunts (uncredited) | |
| Eddie Parker | .... | stunt double: Scott Kolk (uncredited) | |
| Tom Steele | .... | stunt double: Henry Brandon & Jack Cheatham (uncredited) | |
Editorial Department | |||
| Saul A. Goodkind | .... | supervising editor | |
Music Department | |||
| Karl Hajos | .... | composer: stock music (uncredited) | |
| Bernhard Kaun | .... | composer: stock music (uncredited) | |
| Charles Maxwell | .... | composer: stock music (uncredited) | |
| Arthur Morton | .... | composer: stock music (uncredited) | |
| Sam Perry | .... | composer: stock music (uncredited) | |
| Charles Previn | .... | composer: stock music (uncredited) | |
| Heinz Roemheld | .... | composer: stock music (uncredited) | |
| Clifford Vaughan | .... | composer: stock music (uncredited) | |
| Clifford Vaughan | .... | orchestrator (uncredited) | |
| Edward Ward | .... | composer: stock music (uncredited) | |
| Franz Waxman | .... | composer: stock music (uncredited) | |
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| The Spider Returns | The Black Widow | The Galloping Ghost | Dick Tracy Returns | The Secret of Treasure Island |
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| Full cast and crew | Company credits | External reviews |
| IMDb Action section | IMDb USA section |
I've always liked the spy and detective type of serials more than the westerns - and this one is a good example of why. Production standards were quite good and it had all the usual serial excitement, fights, and cliffhangers. Lon Chaney Jr. plays a small part as one of the bad guy's heavies. The crown jewels of Belgravia are worth millions, and are sought by the crooks. Secret Agent X-9 is out to stop their nefarious plans!
This particular title was unavailable until recently. The film print that was used for the DVD is extremely sharp and clear. Its refreshing to see a serial this old and realize that they all looked this good when first shown in the theaters. Its a shame that more of the cliffhangers aren't available in this quality.