Green Lantern: Rebirth
From HallsWiki
A miniseries by Geoff Johns and illustrated by Ethan van Sciver, Green Lantern: Rebirth featured the return of Hal Jordan to the world of the living and the mantle of Green Lantern. Hal's madness (and even his gray hair) was revealed to be the cause of an alien parasite named Parallax, and Hal was restored to life as both the infection and the Spectre were removed. The series also restored Guy Gardner to Green Lantern status, revealed Sinestro to still be alive, and restored the Guardians of the Universe to existence.
