Justice League of America

Background
In 1960, the villain Starro attacked Earth and it took the combined efforts of Aquaman, Green Lantern, The Flash, Wonder Woman and Martian Manhunter to defeat him. Later Superman and Batman joined the team and have sinced expanded their roster.

Involvement
Heroes are recruited into the Justice League and are allowed to access the fuctions of the JLA Watchtower. They also receive missions from various members of the Justice League. Oracle is the main contact for the team.