Parallax is a fictional comic book supervillain in the DC Comics universe. Created by writer Ron Marz and artist Darryl Banks for Green Lantern (vol. 3) #48 (January 1994), Parallax was devised as the new supervillain identity for former Green Lantern protagonist Hal Jordan.
After further changes for the Hal Jordan character over the subsequent years (sacrificing his life in order to reignite Earth’s Sun in the 1996 crossover storyline Final Night, and Jordan’s soul subsequently became the newest host of the Spectre in the 1999 miniseries Day of Judgment), 2004's Green Lantern: Rebirth once again cast Jordan as a heroic Green Lantern and explained Jordan's villainous career as the result of the influence of an alien parasite. Furthermore, with Parallax’s exposure, the Green Lantern Corps' vulnerability to the yellow color can be conquered if a given Lantern, particularly a well-trained one, can muster his or her willpower to overcome their fear.
In 2009, Parallax was ranked as IGN's 92nd Greatest Comic Book Villain of All Time.
In 1994, the Green Lantern books were becoming less profitable, so DC Comics decided to do away with Hal Jordan, hoping to replace him with a new character Kyle Rayner, in order to attract new readers to the failing title. The "Emerald Twilight" storyline began in Green Lantern (vol. 3) #48 (January 1994). Following the complete destruction of his home town Coast City by the villain Mongul, Hal Jordan descends into madness. Jordan went on a rampage, destroying the Green Lantern Corps, killing his friend Kilowog and all of the Guardians except for Ganthet. Hal Jordan became Parallax.
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Official Site: D.C. Comics
Links: Parallax Wikipedia page About.com Hal Jordan page Emerald Dawn.com