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Upon its arrival on Earth, Starro enlisted three starfish "distant relatives" for planetary conquest. To defeat Starro, the JLA encased the nuclear-powered alien in quicklime.
The Justice League of America first appear with Wonder Woman, The Flash, Aquaman, Green Lantern, and the Martian Manhunter teaming to spare the denizens of Happy Harbor, Rhode Island, from the mental thrall of Starro the Conquerer. Superman and Batman are revealed as fellow JLA members, although they do not aid in the adventure. "Young hipster" Lucas "Snapper" Carr is made an honorary member of the JLA and becomes the team's official "mascot". The Secret Sanctuary, a mountain cavern outside of Happy Harbor, is established as the League's first headquarters.