Parallax is the physical embodiment of fear, an entity given power by the emotional electromagnetic spectrum. Thousands of years ago the Guardians of the Universe imprisoned him in their Central Power Battery on Oa, and his presence caused the infamous yellow impurity in the Green Lantern Corps' power rings. During Emerald Twilight he was finally released when he possessed the legendary Hal Jordan, turning him evil and driving him completely insane. Green Lantern: Rebirth showed Jordan released from the malevolent creature's control, although it has since gone on to become a member of Sinestro's Corps when it possessed Kyle Rayner. The concept of the Parallax identity was created by Ron Marz and Darryl Banks, first appearing in Green Lantern #50. (1994) Geoff Johns and Ethan Van Sciver created the entity as a concept and established its sentience in Green Lantern: Rebirth #1. (2005)
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