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Real Name: Nathaniel Adams
Occupation: Hero
Marital Status: Single
Base of Operations: San Francisco
Height: 6ft 4in
Weight: 200 lbs
Eyes: Blue
Hair: None
First Appearance: Initiation
Voiced By: George Eads / Chris Cox

When the Justice League extended invitations to the heroes of Earth following the Thanagarian Invasion, Captain Nathaniel Adams answered the call as Captain Atom, nuclear-powered soldier of justice.

The Captain was one of the first new League members to be given an important assignment: investigating a disturbance in Communist Asia. The "disturbance" turned out to be a walking nuclear superweapon that had gone haywire. Captain Atom was seemingly destroyed in his attempt to stop the machine, much to the distress of fellow recruit Supergirl. However, following the deactivation of the machine by Green Arrow, Captain Atom's sentient energy was re-collected into his containment suit. The hero would quickly return to active duty.

Captain Atom soon proved to be more than capable as a Justice Leaguer, and he quickly gained the respect and admiration of his colleagues, notably Superman, who selected the Captain as his partner while defending Metropolis from Mantis, a second-rate, would-be despot from Apokolips. However, immediately following this adventure Captain Nathanial Adams had his Air Force commission unexpectedly reactivated by General Wade Eiling at the behest of Amanda Waller of Cadmus and Lex Luthor.

Nathanial Adams was torn between his dual commitments, but his first oath of service had been to the United States military. Captain Atom stepped down from his Justice League duties and was soon ordered to stop Superman and the Huntress from taking the captive Question out of a Cadmus facility. He attacked Superman, using red solar radiation to weaken the Man of Steel. However, though acknowledging Captain Atom's valiant effort, Superman merely made sure that Huntress and Question had time to escape before he was forced to incapacitate Captain Atom. Cadmus security arrived on the scene to assist the Captain, but Superman sternly warned them not to touch his fallen comrade: "He's Justice League." Superman then collected Captain Atom and took him to the Watchtower, where the Captain could recover under the watchful eye of the League's medical and science staff.

Captain Atom rejoined the League during the invasion of the Watchtower by Galatea and the Ultimen clones. He was able to climb out of his hospital bed and put up a valiant fight against the clone army while Supergirl fought Galatea. Thanks to the revelation that Lex Luthor and Brainiac had been manipulating both Cadmus and the Justice League, it seems apparent that Captain Atom was discharged from military service and allowed to rejoin the Justice League following Amanda Waller's involvement in the conflict between the League and the Luthor/Brainiac hybrid.

Captain Atom was last seen fighting against the forces of Darkseid during the intergalactic despot's massive invasion of Earth. The Captain survived the conflict, so it is logical to infer that Captain Atom remained with the organization following Darkseid's disappearance.