Once a hero and protector, Thaal Sinestro (Luke Evans) is now an ex-con living in the shadows of Korugar, haunted by the betrayal that cost him everything. But when a dangerous scientist, Krona (Willem Dafoe), resurfaces with plans to weaponize the emotional spectrum, Sinestro is thrust back into a war he never wanted. As he battles Krona’s creations and wrestles with the corrupting influence of the ring, Sinestro must confront the monster within and decide what kind of man he truly wants to be: hero, villain, or something in between.