Also designated on cover as 80 Page Giant (DC, 1964 series) #G50 and as G-50 on indicia page.
On-sale date from copyright registration.
Foreign edition covers. Only first page reprinted.
With one new page (page 7, panel 3 to page 8, panel 1) added.
final 2/3 page of original expanded to full page
Story inspired by the cover of the December 1938 Thrilling Wonder Stories.