Deemed unfit to wield the power of a Green Lantern by the Guardians of the Universe, Sinestro was brought down by his fellow Green Lanterns, including John Stewart, and stripped of his power ring. At some point, Sinestro obtained his own yellow power ring that was every bit as formidable as a Green Lantern power ring, making Sinestro more dangerous than ever and a deadly threat to every Green Lantern in the universe. Swearing a blood oath of revenge and vowing to destroy the Green Lantern Corps, Sinestro began hunting Green Lanterns and collecting their rings.After dispatching Abin Sur, Sinestro was defeated by Kyle Rayner (Abin Sur's successor) and Superman. Later recruited into Grodd's Secret Society in a plot to destroy the Justice League, Sinestro was defeated once more. After that, Sinestro attempted his most ambitious revenge scheme, when he impersonated John Stewart to discredit him as a criminal. A weakened Stewart was nearly imprisoned as a result and was only able to defeat Sinestro and clear his name with Static's assistance. Sinestro later joined the Legion of Doom, notably taking part in a train robbery with Doctor Polaris, Tala, and Lex Luthor. When the Society split between loyalty to Grodd, the original leader, and Luthor, his usurper, Sinestro sided with Luthor. Surviving the battle between both sides, Sinestro saved the lives of his allies by shielding them when a newly resurrected Darkseid destroyed the Society's ship. Putting aside his feud with Green Lantern and the Justice League, Sinestro helped fight back Darkseid's forces, taking on Parademons in Tokyo. In the aftermath, Sinestro and the other surviving members of the Society were given a five minute head-start to run in "consideration" of their help defending the Earth.
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