Al Pratt
The original Atom, Al Pratt, first appeared in All-American Comics #19 (October 1940).[3] He initially had no superpowers; instead, he was a diminutive college student and later a physicist who was depicted as a tough guy, a symbol of all the short kids who could still make a difference. Pratt was a founding member of the Justice Society of America, later gaining limited super-strength, and an energy charged 'atomic punch'. He died in the charge against Extant during the Zero Hour.[4]
Ray Palmer
The Atom introduced during the Silver Age of comic books in Showcase #34 (1961) is physicist and university professor Raymond Palmer, Ph.D. After stumbling onto a mass of white dwarf star matter that had fallen to Earth, he fashioned a lens which allowed him to shrink down to subatomic size. Originally, his size and molecular density abilities derived from the white dwarf star material of his costume, controlled by mechanisms in his belt, and later by controls in the palms of his gloves. Much later, he gained the innate equivalent powers within his own body. After the events of Identity Crisis, Ray shrank himself to microscopic size and disappeared. Finding him became a major theme of the Countdown year-long series and crossover event.[4]
Paul Hoben
Prior to Ray Palmer's trip to the Amazon Jungle, he learns his wife Jean Loring has had an affair with her colleague, Paul Hoben. Palmer and Loring got a divorce. Later, Palmer offers his blessing to the couple when they marry, and he offers Hoben his size-changing belt so that Hoben can protect Ivy Town after Ray returns to the Morlaidhans. Adam Cray would later steal this belt; Hoben never uses the costume or name of the Atom.
Adam Cray
Adam Cray, son of the murdered Senator Joseph Cray, first appeared as the Atom in the pages of Suicide Squad #44 by John Ostrander (August 1990). Cray was initially believed to be Ray Palmer in disguise by members of the team. Cray had been recruited by Palmer (who faked his own death) to apprehend the Micro Squad, a group of villains that had been reduced in size. Palmer intended to use Cray to uncover a shadowy government cabal which was using Palmer to discover the secret identities of other costumed heroes (Palmer's own identity no longer being secret). While Palmer infiltrated the Micro Squad, Cray would attract the attention of the Cabal as the new Atom so that no one would notice Palmer assuming the identity of a fallen Micro Squad member.
Adam Cray remained with the Suicide Squad briefly, serving as a secret weapon whose existence was unknown to others of the Squad. Cray saves Amanda Waller from a group of assassins. At one point, Cray approaches Deadshot about his role in Senator Cray's murder. Later, Cray is impaled through the chest with a screw by Blacksnake, a Micro Squad member who believes him to be Palmer.
After the unanticipated murder of Cray, Palmer reveals himself and defeats Cray's murderer. The ruse ended, Palmer explains himself to the Justice League, who had been searching for him after hearing rumors of a new Atom.
During the events of Blackest Night, Adam's corpse is reanimated as a member of the Black Lantern Corps alongside several other fallen Suicide Squad members.[5]
Ryan Choi
Ryan Choi, as described by DC solicitations, is "a young hotshot professor who's filling the extra spot on Ivy University's teaching staff. .. and who inadvertently ends up filling the old Atom's super-heroic shoes".[9] This new Atom is based on a redesign by Grant Morrison. He debuted in the Brave New World one-shot, a preview of projects, and then appeared in the series The All-New Atom, written by Gail Simone. He is later murdered by Deathstroke and his Titans.
Rhonda Piñeda
The New 52 introduced a new, female Atom, Rhonda Piñeda, a Hispanic American college student from Ivy Town.[10] She is revealed to be working as a reluctant spy for Amanda Waller and Steve Trevor, gathering intel on the new Justice League recruits.[11] At the conclusion of the "Trinity War" storyline, she is revealed to in fact be betraying both teams; she hails from the alternate universe of Earth-3, where she is a member of the Crime Syndicate operating under the name Atomica,[12] an acquaintance of Johnny Quick.[13]
Atom One Million
An unnamed scientist in the 853rd Century performed experiments in superstring theory that creates a singularity and whose radiation alters his physical make-up. When the singularity threatened to expand and destroy his universe, he enters it in an attempt to save the universe but instead finds himself on an interdimensional bridge to another universe as his own is wiped out, unable to stop it. At the end of the bridge, he finds Superman Prime who came to help but was too late. Stranded, he searches this universe for remnants of the one he lost, in time taking the name the Atom and joining the Justice Legion Alpha when he helped them defeat the Bizarro-Legion. This Atom's powers differ from his predecessors in that he doesn't shrink but breaks up into several smaller duplicates of himself divided amongst his mass. At atomic size, these duplicates can mimic elements such as gold and oxygen.[14]
