A Power Battery-charged one-shot --- featuring a cover by the late Gil Kane --- from the writer-penciler team of Kurt Busiek's Astro City! Sent to space to thwart Agamemno's plan to create the ultimate super-weapon, Hal Jordan (in the body of Sinestro), must fight his way to the planet Oa to prove his caseagainst a very suspicious Green Lantern Corps. But will Sinestro's evil yellow power ring corrupt Hal before he convinces his former allies of his goodness?