The Daily Clarion hires detective story writer Steve Colt to investigate the deaths of a group of scientists working on an atomic rocket development project. Behind the killings is fortune teller Sombra, a spy from an Asian country intent on world domination, who is determined to pilfer the atomic rocket by luring workers from the project to her parlor and killing them with black widow spider venom when they refuse to cooperate.
| Actor | Role |
|---|---|
 Bruce EdwardsSteve Colt | Steve Colt |
| VVirginia LeeJoyce Winters (as Virginia Lindley) | Joyce Winters (as Virginia Lindley) |
 Carol FormanSombra, The Black Widow | Sombra, The Black Widow |
 Anthony WardeNick Ward | Nick Ward |
 Ramsay AmesRuth Dayton | Ruth Dayton |
 I. Stanford JolleyDr. Z.V. Jaffa | Dr. Z.V. Jaffa |
| DDave AndersonPorter-Spy | Porter-Spy |
 Theodore GottliebHitomu | Hitomu |
 Virginia CarrollDr. Ann Curry | Dr. Ann Curry |
 Gene RothJohn M. Walker | John M. Walker |
 Sam FlintProf. Henry Weston | Prof. Henry Weston |
 LeRoy MasonDr. Godfrey | Dr. Godfrey |
 Forrest TaylorBradley | Bradley |
 Ernie AdamsBlinky | Blinky |
 Keith RichardsMichael Burns | Michael Burns |
 George ChesebroJ. Carter | J. Carter |
 Frank LackteenA. Kabob | A. Kabob |
 Carey LoftinSpike | Spike |
 Ted MapesSlade | Slade |
 Jack O'SheaFinnegan | Finnegan |
 Gil PerkinsBurke | Burke |
 John PhillipsDistrict Attorney Mark | District Attorney Mark |
 Stanley PriceFilmore Hagen | Filmore Hagen |
 Larry SteersDr. Harcourt | Dr. Harcourt |
 Ken TerrellMendoza | Mendoza |