Once considered the greatest Green Lantern in any sector, Sinestro came to believe that the only way to ensure order in the universe was through the reign of fear, a crime for which the Guardians banished him to Qward. There he created the first yellow power ring and later on founded his own corps, The Sinestro Corps. He has clashed frequently with his former student and protege; Hal Jordan. The relationship between the two is a complicated one, a mixture of both hatred and respect in equal measures.