“The Super-Exiles of Earth!”
 
This issue is the second chapter of the classic Justice League vs. Justice Society crossover that began in #55.
 
The Justice League and Justice Society clash again as misunderstandings escalate.
Members of both teams are exiled to another Earth, forcing unlikely alliances.
The story continues the theme of legacy vs. modern heroes, a hallmark of these annual team-ups.
The JLA/JSA crossover structure established here became an annual DC tradition for decades.
 
This is a key continuity issue, not for first appearances, but for:
 
Solidifying the JLA/JSA crossover format
Deepening Earth-One / Earth-Two mythology
Expanding the role of Robin as a maturing hero