The debut of the Key--one of the JLA's most deadly, yet goofy-looking, foes!
The Story: "The Key-Master of the World!" by Gardner Fox, Mike Sekowsky, and Bernard Sachs. The Key slips the JLA a mickey which messes with their heads and renders them unable to detect his henchmen who are committing a series of robberies. Luckily, guest-star Hawkgirl uncovers the plan and helps the JLA defeat him.
Roll Call: Superman, Batman, Wonder Woman, Flash, Green Lantern, Martian Manhunter, Atom, Hawkman
Notable Moments: Like I said above, the debut of the Key, one of the JLA's long-running foes. The character design is Out There, but his creepy face makes you sorta forget the weird head gear.
Hawkgirl guest stars in this issue, another of her many appearances in the book. I haven't counted(though I guess I should; that's the kind of obsessive detail blogs are for), but I think she guest-starred more than any other superhero--yet her induction into the League took another twelve years, for some reason.