Katma Tui appears in 273 issues.
The Anti-Monitor is the Monitor's counterpart from the Anti-matter Universe. He is responsible for the original Crisis on Infinite Earths, was the sole Guardian of the Sinestro Corps and once, against his will, was the source of the Black Lantern Corps Central Power Battery.
One of Hal Jordan's oldest foes, Black Hand has evolved from a gimmicky criminal into a sadistic madman capable of siphoning lifeforce from his victims. Reanimated after his suicide, he is now an avatar of the Black Lantern.
Once a researcher working for the betterment of mankind, Neal Emerson became a master of magnetism, and one of the deadliest metahumans on Earth.
Dr. Jason Woodrue is the Floronic Man, a plant/human hybrid and super-villain who wishes to eradicate all animal life. In some versions, he is responsible for the creation of Poison Ivy. He is an enemy of The Atom and Swamp Thing.
Genius who evolved himself into a man of the future with a meteor's power. His futuristic brain grants him many powers that make him a very dangerous foe to Green Lantern.
As a Maltusian, Krona is virtually immortal and invulnerable; he possesses vast psionic powers. He is obsessed with finding the origin of the universe itself and how it came into existence. He was the main antagonist of the "Brightest Day" story arc.
Nekron is the embodiment of death and darkness. He has the power to take and restore life as he pleases, contributing to the reanimation of many heroes in the past. Nekron has also recently become the leader and creator of the Black Lantern Corps, making Nekron the harbinger of the Blackest Night.
Roger Hayden became the second Psycho-Pirate when he found the fabled Medusa Mask, an artifact with the ability to control the emotional response of the human brain.
Once considered the greatest Green Lantern in any sector, Sinestro came to believe that the only way to ensure order in the universe was through the reign of fear, a crime for which the Guardians banished him to Qward. There he created the first yellow power ring and later on founded his own corps, The Sinestro Corps. He has clashed frequently with his former student and protege; Hal Jordan. The relationship between the two is a complicated one, a mixture of both hatred and respect in equal measures.
A mad god whose essence merged with Space Sector 3600, creating a sentient galaxy. Once he started threatening other sectors with acts of cosmic destruction, all 36 of the original Guardians united their power to restrain him in an Oan sciencell. He was later freed from his prison by Sinestro.
An alien enemy of Green Lantern and Green Arrow in the pre-Crisis universe.
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