Thaal Sinestro of Korugar is the arch-nemesis of Green Lantern. At one point the greatest member of the Green Lantern Corps, he was corrupted by his power and exiled for crimes against his own people. He now seeks to impose his own order and control onto the universe, employing a yellow power ring to combat the green he has grown to despise. His prowess and ruthlessness have made him one of the most feared villains in existence, and eventually he establishes his own Sinestro Corps. Sinestro was created by John Broome and Gil Kane as an enemy of Hal Jordan and the entire Green Lantern Corps. He first appeared in August 1963 in the comic Green Lantern #7.