Jim Davis

Character: Joseph Cummins

Ian Keith

Character: FBI Director Sinclair

George Travell

Character: Rucca

Frederick Worlock

Character: Hugo Stregel

Stanley Andrews

Character: Mitchell (uncredited)

Hugh Beaumont

Character: FBI Chemist (uncredited)

Ralph Dunn

Character: Vic, Stregel's Thug (uncredited)

Byron Foulger

Character: Pelly, Stregel's Henchman (uncredited)

Ian Wolfe

Character: Gruning, Stregel's Henchman (uncredited)