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Directed by | |||
| Elmer Clifton | |||
| John English | |||
Writing credits | ||
| Royal K. Cole | (original screenplay) (as Royal Cole) and | |
| Ronald Davidson | (original screenplay) and | |
| Basil Dickey | (original screenplay) and | |
| Jesse Duffy | (original screenplay) and | |
| Harry L. Fraser | (original screenplay) (as Harry Fraser) and | |
| Grant Nelson | (original screenplay) and | |
| Joseph F. Poland | (original screenplay) (as Joseph Poland) | |
| Jack Kirby | character (uncredited) | |
| Joe Simon | character (uncredited) | |
| Dick Purcell | ... | Captain America / Grant Gardner | |
| Lorna Gray | ... | Gail Richards | |
| Lionel Atwill | ... | Dr. Cyrus Maldor / Dr. Rodlam Baracs | |
| Charles Trowbridge | ... | Commissioner Dryden | |
| Russell Hicks | ... | Mayor Randolph | |
| George J. Lewis | ... | Bart Matson | |
| John Davidson | ... | Gruber | |
| Norman Nesbitt | ... | Newscaster | |
| Frank Reicher | ... | Prof. Lyman [Ch. 1] | |
| Hugh Sothern | ... | Prof. Eldon Dodge [Chs. 2-5] | |
| Tom Chatterton | ... | J.C. Henley [Chs. 6-8] | |
| Robert Frazer | ... | Dr. Clinton Lyman [Chs. 10-12] | |
| John Hamilton | ... | G. F. Hillman [Chs. 13-14] | |
| Crane Whitley | ... | Dirk [Chs. 11-12] | |
| Edward Keane | ... | Scarab Agent 33 [Ch. 15] | |
| John Bagni | ... | Henchman Monk | |
| Jay Novello | ... | Henchman Simms [Ch. 1] | |
| rest of cast listed alphabetically: | |||
| Sam Ash | ... | Florist #2 [Ch. 1] (uncredited) | |
| Brooks Benedict | ... | Florist #1 [Ch. 1] (uncredited) | |
| Wilson Benge | ... | Lyman's Butler [Ch. 10] (uncredited) | |
| Lynton Brent | ... | Airplane Mechanic [Chs. 8-9] (uncredited) | |
| Roy Brent | ... | Nick (uncredited) | |
| George Byron | ... | Walt Davis (uncredited) | |
| James Carlisle | ... | J.V. Wilson - First Victim [Ch. 1] (uncredited) | |
| Ed Cassidy | ... | Tec-Ni-Gas Co. Gate Guard [Ch. 7] (uncredited) | |
| James Conaty | ... | Victim [Ch. 1] (uncredited) | |
| Lorn Courdaye | ... | Gas Station Attendant [Ch. 5] (uncredited) | |
| Hal Craig | ... | Patrolman #2 (uncredited) | |
| John Daheim | ... | Dodge Bldg. Thug #2 [Chs. 1-2] / Lab Thug [Chs. 11-12] (uncredited) | |
| George DeNormand | ... | Pete (uncredited) | |
| Kenne Duncan | ... | Ed Graham [Ch. 14] (uncredited) | |
| Ben Erway | ... | Used Car Lot Manager [Ch. 7] (uncredited) | |
| Al Ferguson | ... | Detective [Ch. 8] (uncredited) | |
| Terry Frost | ... | Police Broadcaster [Ch. 3] (voice) (uncredited) | |
| Bud Geary | ... | Thug at Grant's Office [Ch. 13] (uncredited) | |
| Fred Graham | ... | Agent B-10 [Chs. 4, 8-9] / Farm Thug [Chs. 14-15] (uncredited) | |
| Duke Green | ... | Platinum Vault Thug [Chs. 3-4] / Nitro-Gas Thug [Ch. 7] (uncredited) | |
| Ralf Harolde | ... | Tate - Apartment Thug [Ch. 2] (uncredited) | |
| Howard C. Hickman | ... | Lyman's Attorney [Ch. 4] (uncredited) | |
| Charles Hutchison | ... | Merritt [Chs. 1-2] (uncredited) | |
| Jerry Jerome | ... | Eddie the Informer [Ch. 1] (uncredited) | |
| Jack Kirk | ... | Express Truck Driver [Ch. 5] (uncredited) | |
| Glen Knight | ... | Morgue Wagon Driver [Ch. 11] (uncredited) | |
| Bert LeBaron | ... | Airport Thug [Chs. 8-9] / Dynamite Thug [Ch. 10] (uncredited) | |
| Tom London | ... | Mack - Garage Thug [Ch. 7] (uncredited) | |
| Herbert Lytton | ... | Carl Evans - Second Victim [Ch. 1] (uncredited) | |
| George Magrill | ... | Mechanic Thug [Ch. 7] (uncredited) | |
| Paul Marion | ... | Morgue Wagon Hijacker #1 [Chs. 9, 11] (uncredited) | |
| LeRoy Mason | ... | Bates, Florist #3 [Ch. 1] (uncredited) | |
| Frank O'Connor | ... | Officer at Estate Gate [Ch. 8] (uncredited) | |
| Jack O'Shea | ... | Express Truck Crewman [Ch. 5] (uncredited) | |
| Post Park | ... | Detective [Ch. 8] (uncredited) | |
| Gil Perkins | ... | Barn Thug [Ch. 2] / Hotel Room Thug [Ch. 9] / Waiter Thug [Chs. 13-14] (uncredited) | |
| Allen Pomeroy | ... | Cave Thug [Chs. 6-7] (uncredited) | |
| Stanley Price | ... | Purple Death Chemist [Ch. 1] (uncredited) | |
| Jeffrey Sayre | ... | Norden [Chs. 1-2] (uncredited) | |
| George Sherwood | ... | Officer Clancy (uncredited) | |
| Tom Steele | ... | Thug at Lyman's [Ch. 1] (uncredited) | |
| Harry Strang | ... | Police Mechanic [Ch. 4] (uncredited) | |
| Robert Strange | ... | Gang Lawyer [Ch. 12] (uncredited) | |
| Ben Taggart | ... | Police Sgt. Donovan [Chs. 5, 9] (uncredited) | |
| Ken Terrell | ... | Dodge Bldg. Thug [Chs. 1-2] / Gang Sharpshooter [Ch. 6] / Phony Humane Society Driver [Ch. 10] (uncredited) | |
| Dale Van Sickel | ... | Callbox Motorcycle Cop [Ch. 3] / Rick - Phony Humane Society Workman [Ch. 10] (uncredited) | |
| Edward Van Sloan | ... | Gregory, Lyman's Aide [Chs. 1-2] (uncredited) | |
| Robert J. Wilke | ... | Thug with B-10 [Ch. 4] (uncredited) | |
| Joe Yrigoyen | ... | Box Co. Thug [Chs. 5-6] / Barn Thug [Ch. 9] (uncredited) | |
Produced by | |||
| William J. O'Sullivan | .... | associate producer (as W.J. O'Sullivan) | |
Original Music by | |||
| Mort Glickman | |||
Cinematography by | |||
| John MacBurnie | (photography) | ||
Film Editing by | |||
| Wallace Grissell | |||
| Earl Turner | |||
Art Direction by | |||
| Fred A. Ritter | (as Fred Ritter) | ||
Set Decoration by | |||
| Charles S. Thompson | (as Charles Thompson) | ||
| John McCarthy Jr. | (uncredited) | ||
| Otto Siegel | (uncredited) | ||
Makeup Department | |||
| Ern Westmore | .... | makeup supervisor (uncredited) | |
Production Management | |||
| Mack D'Agostino | .... | unit manager | |
| Max Schoenberg | .... | production manager (uncredited) | |
Sound Department | |||
| Ed Borschell | .... | sound | |
| Daniel J. Bloomberg | .... | sound (uncredited) | |
| Herbert Norsch | .... | sound effects (uncredited) | |
Special Effects by | |||
| Theodore Lydecker | .... | special effects | |
| Howard Lydecker | .... | special effects (uncredited) | |
Visual Effects by | |||
| Gordon Schaefer | .... | process photography (uncredited) | |
Stunts | |||
| John Bagni | .... | stunts (uncredited) | |
| John Daheim | .... | stunts (uncredited) | |
| Fred Graham | .... | stunts (uncredited) | |
| Duke Green | .... | stunt double: Lionel Atwill (uncredited) | |
| Duke Green | .... | stunts (uncredited) | |
| Charles Hutchison | .... | stunts (uncredited) | |
| Jerry Jerome | .... | stunts (uncredited) | |
| Bert LeBaron | .... | stunt double: Lionel Atwill (uncredited) | |
| George Magrill | .... | stunts (uncredited) | |
| Post Park | .... | stunts (uncredited) | |
| Eddie Parker | .... | stunts (uncredited) | |
| Allen Pomeroy | .... | stunts (uncredited) | |
| Tom Steele | .... | stunts (uncredited) | |
| Ken Terrell | .... | stunt double: George J. Lewis & Crane Whitley (uncredited) | |
| Helen Thurston | .... | stunt double: Lorna Gray (uncredited) | |
| Dale Van Sickel | .... | stunt double: Dick Purcell (uncredited) | |
| Joe Yrigoyen | .... | stunts (uncredited) | |
Costume and Wardrobe Department | |||
| Adele Palmer | .... | wardrobe supervisor (uncredited) | |
| Robert Ramsey | .... | wardrobe supervisor (uncredited) | |
Music Department | |||
| Herman Hand | .... | composer: additional music (uncredited) | |
| Herman Hand | .... | orchestrator (uncredited) | |
| Walter Scharf | .... | composer: stock music (uncredited) | |
| Walter Scharf | .... | musical director (uncredited) | |
| Marlin Skiles | .... | composer: additional music (uncredited) | |
| Company credits | Box office and business | Technical specifications |
| Crazy credits | Main details |