| Richard Webb | ... | Lane Carson | |
| Aline Towne | ... | Carol Richards | |
| Lane Bradford | ... | Burton | |
| Stanley Price | ... | The Phantom Ruler | |
| John Crawford | ... | Harris | |
| George Meeker | ... | Harry Long | |
| Keith Richards | ... | Doctor [Ch.12] | |
| Dale Van Sickel | ... | Otto Wagner / 'Frank Martin' [Chs. 1, 10] | |
| Tom Steele | ... | Bill 'Mack' Haines, thug [Chs.5,10] | |
| Marshall Reed | ... | MacDuff, Roadblock Cop [Chs.1, 7-9] | |
| Forrest Burns | ... | Joe, Watchman [Ch.5] | |
| Eddie Parker | ... | Stoner, Barn Henchman[Ch.9] (as Ed Parker) | |
| Frank O'Connor | ... | Chemical Truck Cop [Ch.5] | |
| Charles Regan | ... | Art (as Chas Regan) | |
| Charles Sullivan | ... | Grogarty, Squad Car Cop [Chs.7-8] | |
| Howard M. Mitchell | ... | Second Garage Watchman [Ch.7] (as Howard Mitchell) | |
| Bud Wolfe | ... | Harding, Henchman [Ch.8] | |
| rest of cast listed alphabetically: | |||
| Douglas Evans | ... | James Hunter [Chs. 1, 3, 7, 12] (uncredited) | |
| Harold Goodwin | ... | Kirk, Body-Shop Henchman [Ch.11] (uncredited) | |
| Roy Gordon | ... | Mr. Moore [Chs.8-9] (uncredited) | |
| John Hamilton | ... | Henry Miller [Chs. 1, 8, 12] (uncredited) | |
| Edward Keane | ... | Warren Madison (uncredited) | |
| Bert LeBaron | ... | Crooked Watchman [Ch.2] (uncredited) | |
| Carey Loftin | ... | Dirk - Dynamite Thug [Ch.6] (uncredited) | |
| George Magrill | ... | Sam, Thug-Truck Driver [Chs.4-5] (uncredited) | |
| Tom Monroe | ... | Gates, Cop in Cave [Ch.7] (uncredited) | |
| David Sharpe | ... | 3rd Garage Watchman [Chs. 3-4] / 2nd Armored Car Guard [Ch. 11] (uncredited) | |
| Mark Strong | ... | Bank Watchman [Ch.1] (uncredited) | |
| Duke Taylor | ... | Second Roadblock Cop [Ch.1] (uncredited) | |
| Guy Teague | ... | Al, Decoy & Dumptruck Thug [Chs. 5, 7] (uncredited) | |
| Ken Terrell | ... | Kern, Henchman [Chs. 8-9] (uncredited) | |
| George Volk | ... | Second Armored Car Guard [Ch.11] (uncredited) | |
Directed by | |||
| Fred C. Brannon | |||
Writing credits | ||
| Ronald Davidson | (written by) | |
Produced by | |||
| Franklin Adreon | .... | associate producer | |
Original Music by | |||
| Stanley Wilson | |||
Cinematography by | |||
| Ellis W. Carter | (director of photography) | ||
Film Editing by | |||
| Cliff Bell Sr. | (as Cliff Bell) | ||
| 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 | |
| Lewis T. Rosso | .... | production manager (uncredited) | |
Sound Department | |||
| Earl Crain Sr. | .... | sound | |
Special Effects by | |||
| Howard Lydecker | .... | special effects | |
| Theodore Lydecker | .... | special effects | |
Stunts | |||
| Bert LeBaron | .... | stunts (uncredited) | |
| Carey Loftin | .... | stunts (uncredited) | |
| George Magrill | .... | stunts (uncredited) | |
| Eddie Parker | .... | stunts (uncredited) | |
| David Sharpe | .... | stunts (uncredited) | |
| Tom Steele | .... | stunt double: Richard Webb (uncredited) | |
| Duke Taylor | .... | stunts (uncredited) | |
| Guy Teague | .... | stunts (uncredited) | |
| Ken Terrell | .... | stunts (uncredited) | |
| Dale Van Sickel | .... | stunt double: George Meeker & Roy Gordon (uncredited) | |
| Bud Wolfe | .... | stunts (uncredited) | |
Camera and Electrical Department | |||
| Bud Thackery | .... | process photographer (uncredited) | |
Costume and Wardrobe Department | |||
| Adele Palmer | .... | wardrobe supervisor (uncredited) | |
Music Department | |||
| Robert Armbruster | .... | composer: stock music (uncredited) | |
| R. Dale Butts | .... | composer: stock music (uncredited) | |
| Joseph Dubin | .... | composer: stock music (uncredited) | |
| Mort Glickman | .... | composer: stock music (uncredited) | |
| Jerry Roberts | .... | musical director (uncredited) | |
| Walter Scharf | .... | composer: stock music (uncredited) | |
| Nathan Scott | .... | composer: stock music (uncredited) | |
| Roy Webb | .... | composer: stock music (uncredited) | |
Other crew | |||
| Earl Johnson | .... | dog trainer (uncredited) | |
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| The Black Widow | The Spider Returns | Government Agents vs Phantom Legion | King of the Rocket Men | Federal Agents vs. Underworld, Inc. |
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| Full cast and crew | Company credits | External reviews |
| IMDb Action section | IMDb USA section |
If you haven't seen many serials, this would be a good start. If you're a serial veteran, you'll recognize almost all of the cliffhanger endings, which have been lifted from other Republic serials. Richard Webb, later TV's Captain Midnight, delivers a stiff performance and a lot of punches: at least one set per chapter is demolished in a slugfest. John Hamilton, TV's Perry White in Superman, has a small part in the first and final chapter. For plot, there's even less logic than usual: bad guy wants to take over world with an army of invisible soldiers, but can barely manage to keep himself invisible. Overall, below average.