Oa
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Real Identity: Not Applicable
Appearances (STAS): In Brightest Day
Appearances (JL/U): In Blackest Night Part One, Part Two, and The Return
Appearances (JLI): The Mirror Crack'd Part Seven
Powers/Skills: None
Voiced By: Not Applicable
Oa is one of the oldest planets in the universe. After the Maltusians evolved, the immigrated to Oa, a lifeless desert planet, and used it for their base of operations as the Guardians of the Universe. Oa also serves as headquarters for the Green Lantern Corps. An automated defense system is lined along the exterior of the Corps buildings. The citadel houses a dining hall, meeting hall, The Hazard Simulation Facility, The Hall of Great Service, The Sector House, The Sciencells, The Memorial Hall, and the Central Power Battery.
The Hazard Simulation Facility is the Corps' training area where Green Lanterns can test themselves in non-lethal scenerios. The Hall of Great Service is the library and holds the Book of Oa, the bible and lawbook of the Corps. A Green Lantern holds the position of archivist superior. Sector Houses allow Lanterns to hold criminals as they await escort back to the Oan sciencells. The Sciencells were constructed to contain the most ruthless criminals in the universe. The Memorial Hall honors Green Lanterns who lost their lives in the line of duty. A Green Lantern named Morro acts as the Hall's cryptkeeper.
The Central Power Battery is the repository of the collective power of the Guardians of the Universe, the Green Lantern Corps, and formerly the Manhunters. Its contents are believed to be unlimited as it has to service the Guardians, 3600 active Green Lanterns, 3600 alternate Green Lanterns in training, and planetary defenses at all times. The Battery became the target of the Manhunters, who were out to reclaim their power, what they believe was stolen from them. The trial of Jon Stewart, set up by the Manhunters, distracted enough of the Lanterns and Guardians for the robots to stage a full-scale invasion of Oa. Several Lanterns and the Justice League returned in time to beat back their forces. Meanwhile, Stewart confronted the Manhunter leader. Just as it assimilated the power of the Central Power, Stewart recited the Green Lantern Oath and reversed the flow of power, causing the Manhunter to be absorbed and eliminated within the Central Battery.
Years later, Oa was briefly visited by AMAZO, while it was returning to Earth. In a rather childish move, AMAZO didn't go around the planet and chose to teleport it to an undisclosed location. The Green Lantern Corps believed AMAZO destroyed Oa and planned a last ditch suicidal attack on AMAZO. However, Lex Luthor managed to talk it down and after Dr. Fate offered sanctuary, AMAZO revealed what he did with Oa. At Stewart's request, AMAZO moved the planet back to its original orbit in space.