The Black Widow (1947) is a Republic serial film in 13 chapters. The Editor of the Daily Clarion newspaper hires amateur criminologist Steve Colt to solve a series of murders, all involving venomous spider bites.

Meanwhile, King Hitomu has sent his daughter Sombra to the United States to fulfill his plan for global domination. There she poses as a fortune teller and, with a gang of henchmen, attempts to steal a prototype Atomic Rocket Engine using her uncanny ability to impersonate other women.

Cast

Bruce Edwards as Steve Colt, an amateur criminologist on the trail of a series of bizarre murders.
Virginia Lindley as Joyce Winters, Colt's friend who Sombra impersonates in order to get close to him.
Carol Forman as Sombra, daughter and agent of King Hitomu. She is an expert at disguises, manipulation, and planning.
Anthony Warde as Nick Ward, a gangster working with Sombra
Ramsay Ames as Ruth Dayton, a secretary who is kidnapped and replaced with Sombra in a mask and wig.
I. Stanford Jolley as Dr. Z.V Jaffa, a scientist working with Sombra
Theodore Gottlieb as King Hitomu, a villain intent on world domination
Forrest Taylor as Bradley, a gang lawyer
Virginia Carroll as Dr. Ann Curry


text from wikipedia