Atom
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Real Identity: Dr. Ryan Choi
Appearances: Evil Under the Sea!, Journey to the Center of the Bat!, Game Over for Owlman!, Mayhem of the Music Meister!, Aquaman's Outrageous Adventure!, The Power of Shazam!, The Siege of Starro! Part One, and Part Two
Powers/Skills: Size Manipulation, Genius, and Above Average Physical Attributes
Voiced By: James Sie
Originally born in Kowloon, Hong Kong, Dr. Ryan Choi is currently a professor of nuclear physics at Ivy University. When he began working at Ivy University, Choi received the Bio-Belt from a fellow colleague. With the belt, Choi quickly discovered he could manipulate his height from his full size to the subatomic scale while retaining any mass, weight, and density. As the Atom, he set out to explore the microscopic world and use the belt for the advancement of society. Atom also used his ability to shrink an array of scientific instruments and keep them in his belt, including a swab, microscope, electromagnetic discharge gun, and field pressurizer. Despite his career as a super hero, the Atom preferred to use logic and science to a catch all solution rather than use his feelings.
When Batman learned Felix Faust discovered Pandora's Box, he recruited the Atom for help. While reduced to a subatomic size, the Atom avoided Faust's detection and helped Batman prevent Pandora's Box from being re-opened.
He continued to work as a physicist and his current project was a five month study on tachyon detection. The experiment was put on hold when the Atom was contacted by Aquaman. Upon study, the Atom deduced that he would have to go inside Batman to destroy the infection he caught from Chemo. Despite his reservations, the Atom was accompanied by Aquaman, his ideological counterpart. After a momentary lapse in judgement, the Atom was able to destroy the seed cell and cure Batman.
In case any of his allies were compromised, Batman devised methods to defeat them. After Owlman escaped his prison in the Batcave, he stole Batman's files and implemented the weapons. The Atom was collected into a special vacuum storage unit. Owlman imprisoned Atom under a death trap that would eventually squash him. Months later, the Atom was locked in battle with the Bug-Eyed Bandit on the windshield of Aquaman's RV. Unable to help because of a promise to his family, Aquaman simply swept them off with his windshield wipers. Some time later, the Atom was one of the heroes taken control by Starro clones. While under its control, the Atom guarded the signal intended to guide Starro to Earth, a satellite in Star City. When Batman arrived to disable it, he fought Atom and trapped him under a vial.