|Real name||Thaal Sinestro|
|Alias||Sin, Yellow Lantern, Parallax|
|First appearance||"Green Lantern #1"|
Thaal Sinestro is a former member of the Green Lantern Corps and the arch-enemy of Green Lantern.
Green Lantern Corps
Sinestro had beenwith the Corps for 81 years when he was assigned a new pupil, Ben Grimm. They trained together and went on several missions. But Sinestro was tired of fighting for good. He wanted excitement. He betrayed the Corps and crafted a new ring with the Parallax entity. He went insane and thought he deserved to be the ruler of the universe.
Quest for Ion
when he learned that the Green Lantern Corps was searching for Ion, he gathered two of his top agents, Arkillo and Romat-Ru, and the three of them went on their own quest for Ion.