Justice League of America 1960 #56 - 7.0 - $19.00

The JLA and JSA team up to stop the Black-Sphered Villains on Earth-2, using artificial means to power up four of their own with black matter, but it almost backfires when the four heroes become evil. The remaining heroes are then subconsciously helped by the four heroes into defeating them by exposing their weaknessses. These same weaknesses are then used vs. the four earlier-charged normal persons, who then lose their powers as well. Things are returned to normal on Earth-2, and the four Leaguers return to their world to stop the charged persons there using the same weaknesses.

On-sale date from copyright registration.

• Justice League vs. Justice Society! - Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
• Help Wanted - inside front cover; house ad for The Adventures of Bob Hope (DC, 1950 series) #107, on sale August 3
• The Negative Crisis on Earths One-Two! - Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. Story across 23 pages, but pages 12 and 23 are half-pages. JLA-JSA team-up. Story concluded from previous issue.
• - letters submitted by Leonard Rosenberg; Ken Lucas; Richard H. Volbrecht Jr.
• Get Set for an Electrifying Experience! - house ad for Superman's Girl Friend, Lois Lane (DC, 1958 series) #77 [80 Page Giant #G-39], on sale June 29
• - hint submitted by Mike Grazier of San Marcos, Texas
• - listing of DC comics on sale in late July and Early August 1967; includes cover art for Action Comics (DC, 1938 series) #354 and Challengers of the Unknown (DC, 1958 series) #58