The JLA and JSA are attacked during their annual reunion by Johnny Thunder's Thunderbolt. However, only Earth-One heroes are effected by the attack. The JSA must deal with the Crime Champions, who are attacking various locations on Earth-One.
Black Canary (2) origin with cameos by Aquarius, Atom, Batman (Earth-1), Doctor Mid-Nite, Hawkman (Earth-1), Green Arrow, Larry Lance, Superman (Earth-1 and Earth-2).
Story takes place after events in Green Lantern (1960) #172.