Guy is a muscular Caucasian male with short red hair and green eyes. He wears black pants and a black sleeveless shirt with a green front. The symbol of the Green Lantern Corps is featured in the middle. He wears black fingerless gloves, and like other Green Lanterns, has a power ring.
Guy Gardner eventually became a member of the Justice League. Shortly before December 1, 2015, he encountered the new Blue Beetle. He reported his opinions on the young hero to Nightwing, and had to begrudgingly admit he liked the new hero.
The League finally arrives at Mount Justice, Guy Gardner among them. The mountain was in ruins, and Superman wondered whether they were already too late in dealing with the invasion that embroiled the Earth before and during their absence. Members of the Team descended from the heavens, acting as a welcoming committee. Batman asked Aqualad, who in their last meeting was still a traitor, what happened there. Aqualad reassured them that the crisis has passed, but not without loss.
Guy Gardner joined Hal Jordan, John Stewart, Superman, and Captain Marvel in escorting the Reach flagship away from the United Nations building and into space. Upon leaving the Earth's atmosphere, the Green Lanterns accompanied the Reach fleet remnants towards Oa, where they would stand trial before the Guardians of the Universe.
Guy Gardner was the second relief Lantern for Hal Jordan, summoned when John Stewart was down. He was one of two people selected by Abin Sur for replacement, but Hal Jordan was closer. This did not sit well with Gardner, who would repeatedly declare himself the best Lantern.