Green Lantern (1990-2004) #50

The conclusion of 'Emerald Twilight.' In order to stop a Hal Jordan who has gone mad with grief, the Guardians of the Universe have unleashed the diabolical Sinestro, Hal's former mentor and greatest adversary. It's the final showdown: Hal Jordan vs. Sinestro to the death, all culminating in the debut of a new Green Lantern!