Sinestro

Thaal Sinestro is a fictional supervillain appearing in American comic books published by DC Comics, particularly those featuring Green Lantern. Sinestro was a member of the Green Lantern Corps who was expelled for abusing his power. He is Green Lantern (Hal Jordan)'s archenemy and the founder of the Sinestro Corps.

Fictional character biography
Sinestro was born on the planet Korugar located in space sector 1417. His dedication to preserving order originally manifested in his previous career, an anthropologist specializing in reconstructions of ruins of long-dead civilizations. One day while he was one such site, a Green Lantern named Prohl Gosgotha crash-landed into the site, injured and apparently dying.