Thaal Sinestro of the planet Korugar in Sector 1417 is an intergalactic super-villain and antagonist of Green Lantern. Originally known as the greatest member of the Green Lantern Corps ever to wield a ring, he trained many students including Hal Jordan. The Guardians of the Universe exiled him to the Antimatter Universe after learning he had used his power to set up a brutal dictatorship. Having fought the Green Lanterns for many years with a yellow ring forged by the Weaponers of Qward, eventually he established his own Sinestro Corps to spread fear throughout the universe.