Notes:
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 443357.
Character(s):
The Green Mask [Michael Shelby]; Gorsky (first appearance; villain); J. J. Ratfield (first appearance; villain); the Black Hand (first appearance; villain)
First Line:
A foreign dictator tries to take over New York...