He was once the pride of the Green Lantern Corps. Now, he is their greatest shame. Once, Thaal Sinestro of the planet Korugar was the Green Lantern of space sector 1417, and one of the most respected members of the Corps. His best friend was Abin Sur, the heralded Lantern of sector 2814, and he helped to train Abi Sur’s replacement, Hal Jordan of Earth. There were few sentient beings in the universe who did not respect his skill with a power ring.
But in his desire for absolute order, Sinestro used the vast abilities of his Oan power ring to enslave his home planet of Korugar. When the Guardians of the Universe discovered Sinestro’s abuse of power, they stripped him of his ring, and banished him to the Anti-Matter Universe of Qward. But instead of humbling the deposed dictator, it was in this universe that Sinestro found a new source of strength; a yellow power ring, one fueled by the power of fear.
Eventually escaping banishment, Sinestro would attack the Green Lantern Corps time and time again, eventually being executed for his crimes. But even death couldn’t stop Sinestro, as he returned from the grave with a renewed sense of purpose, and armed thousands of other beings with yellow power rings similar to his own, starting his very own Sinestro Corps. Now the name Sinestro strikes terror across the universe, and shows no signs of slowing down.