escapes and continues to menace Hal. He tries to attack the Guardians after trapping Hal, before disguising himself as Hal so he can occupy a meeting of Green Lanterns and absorb power from their rings by casting an illusion of a monster so that they would use their rings. However, Jordan escapes and defeats Sinestro on Oa, who is placed in a green energy container which orbits the Universe by the power of many Green Lanterns. He escapes with a power ring hidden in his boot. Post-Crisis Before the Guardians take a leave of absence from their universe to attempt mating with their female counterparts, the Zamarons, they construct an inescapable prison for Sinestro and thousands of others on Oa. Sinestro manages to free himself through the mental manipulation of the Mad God of Sector 3600. Wielding nearly unlimited power, Sinestro murders entire star systems until he is finally subdued by the Green Lantern Corps of Earth. Guilty of multiple acts of genocide, Sinestro is put on trial again by the assembled membership of the Green Lantern Corps. Finding him guilty, they condemn him to death and execute him. Sinestro manages to cheat death by sending his essence into the Central Power Battery and shutting it down. While in the Battery, he also makes a startling discovery about the ancient weakness to yellow within the Green Lanterns' light. Hal Jordan enters the Battery in a desperate attempt to restore the powers of his fellow Lanterns and ultimately defeats Sinestro, whose spirit is condemned to remain trapped inside the Central Battery, powerless, for eternity. Yet Sinestro earns an even greater personal victory as the so-called "yellow impurity" turns out to be a sentient entity known as Parallax, the living embodiment of fear. He also discovers the battery's power source is Parallax's green counterpart, Ion, the embodiment of willpower. Thanks to Sinestro's actions, Parallax successfully infects Jordan's mind, leaving the so-called "greatest Green Lantern" vulnerable to fear for the first time in his life and setting up Sinestro's ultimate triumph. Guy Gardner Sinestro's original yellow ring is stolen by Guy Gardner from Oa's Crypt of the Green Lantern Corps. During the encounter, Sinestro possesses John Stewart to confront Guy, but his spirit is not strong enough to defeat Gardner's willpower. As the yellow ring only "speaks" Sinestro's native language, Guy was unable to communicate with it, which seems to understand him to