Thaal Sinestro is a member of the Green Lantern Corps. He is well-respected by members in the Corps and viewed as rash by others. Yearning deeply for justice using extreme actions, to the extent of refusing to save wrongdoers and leaving them to die. Sinestro was Hal Jordan's mentor for a time. He also joined the battle of Khund, where he didn't act according to the battle plans and took out ten platoons single-handedly.