Ryan Choi appears in 160 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.
The Batman Who Laughs is the Dark Knight of Earth -22, and the chosen herald of Barbatos. He was infected by a nanotoxin in the Joker's bloodstream upon his enemy's death, and the combination of the Joker's depravity and Bruce Wayne's tactical mind created the deadliest villain his planet had ever seen.
Combining the scientific fields of entomology and microelectronics allowed this villain to direct a criminal robotic swarm.
Cheshire is one of the deadliest assassins in the DC universe. She is an expert in both martial arts and the use of poisons.
Chronos is a long time enemy of the second atom, and is considered the arch enemy of the atom.
A pyrokinetic on Deathstroke's new mercenary team, The Titans.
Mayland was told by Chronos to eliminate Palmer's replacement as the Atom
Member of the Extremists
Genetically engineered to surpass all human limits, Slade Wilson was once a soldier but now works as one of the most feared assassins in the DC Universe. He has frequently clashed with the Teen Titans, Batman, Green Arrow, the Justice League, and even gods!
Devastator is the Batman of Earth -1. Betrayed when his world's Superman went rogue, he infected himself with the Doomsday virus to become a monster powerful enough to destroy the Man of Steel.
Albert Desmond used a special gun to commit crimes as Mr. Element. Later, he discovered the fabled Philosopher's Stone and used it to do battle with a number of heroes, most often the Flash.
Once a researcher working for the betterment of mankind, Neal Emerson became a master of magnetism, and one of the deadliest metahumans on Earth.
A psychotic serial killer and frequent enemy of the Atom. He is a hired killer but loves it so much he would do it for free.
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.
One of the classic Atom foes from the 1960s. first appearing in The Atom #25 July 1 1966.
Kalibak the Cruel also known as the Scourge of Apokolips, one of the New Gods and the firstborn of tyrant Darkseid, Kalibak frequently clashs with his brother Orion to prove himself as the one true son of Darkseid.
Drury Walker, the Killer Moth, is the original "anti-batman" who has a central theme of moths. Killer Moth is usually depicted as a joke villain but has posed an actual threat on several occasions.
Formerly Ryan Choi (Atom)'s girlfriend, Jia eventually hooked up with Chronos and became known as Lady Chronos.
M'Nagalah was an ancient and powerful cosmic being.
Prometheus is a twisted mirror image of Batman. As a child he watched in horror as police slaughtered his criminal parents in a Bonnie and Clyde style shoot-out.
At their death, he swore from that day forward to annihilate "the forces of justice."
Tattooed man has the ability to mentally control the tattoos on his body.
Arch-criminal scientist who battled the Justice League of America.
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