Brainwave Jr. appears in 136 issues.
The second Amazing-Man and Extreme Justice fought Brainwave Jr.'s Legion of Doom during a point when Brainwave Jr's sanity was in question.
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.
Originally the Golden Age Robin, Dick Grayson from Earth-2 is the third Batman replacing the deceased Bruce & Thomas Wayne and now the world's Oracle.
Jeffrey Burr is the leader of Kobra, a deadly snake-worshiping cult aimed at bringing about the Kali Yuga to wipe away the corrupt modern world and replace it with something divine.
She was an opponent of the Justice Society. She is a powerful sorceress whose dimension and that of the Earth coincide once every 1000 years. Due to a machination by an enemy, in the later merger part of her powers was granted to Sally Barnes a human avatar. Lorelei wrecked terror on Gotham City until the end of the merger.
Mekanique is constructed of metals unknown to Earth. She can fire electrical blasts and project a powerful "neutron shield." She can also teleport herself and others through dimensions.
Roger Hayden became the second Psycho Pirate when he found the fabled Medusa Mask, an artifact with the ability to control men's minds. The emotion vampire soon broke down the mental barriers to Brainwave's mind, striking the first break in Henry's vulnerable psyche.
One of the first supervillains and a formidable mentalist, Brainwave would pit his vast powers of the mind against the mighty gorilla.
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