Volume number and the on sale date from the publication date found at the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, January-December 1940, Numbers 1-4. Class B periodical. Copyright number B 440425.
Batman [Bruce Wayne]; Commissioner James Gordon; John Davis (G-Man, death); Henry Jenkins (electrical engineer); Clancy (Policeman); Professor Hugo Strange (villain, introduction); Strange's gang (villains)
After he witnesses the death of a G-Man and obtaining a clue as to the perpetrator, Hugo Strange, the Batman has to battle a deadly fog created by Strange that he uses to commit crimes.