DC COMICS: DC Animated Universe Bio Atom Smasher

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ANIMATED BIO BY DCAU WIKI
Atom-Smasher was one of the League's powerhouses, and often fought in the front lines. He battled the Dark Heart, Task Force X, and the Ultimen invasion.

COMIC BOOK BIO BY DC COMICS DATABASE
Albert Rothstein was the grandson of the reluctant supervillain known as Cyclotron, whom Albert inherited his metahuman powers in which he can control his molecular structure (allowing him to alter the size and density of his body) from his grandfather. He was the godson of Al Pratt, the Golden Age Atom, and raised to becoming a hero known as Nuklon and becoming a charter member of [http://dc.wikia.com/wiki/Infinity,_Inc. Infinity, Inc. ] and subsequently served in the Justice League. He took the Atom Smasher identity shortly before the founding of the current Justice Society of America, of which he was a charter member. He viewed Pratt's son, Damage, as a brother, and acted as an older brother figure to Stargirl. While Stargirl has (or at least had) some romantic feelings for Atom Smasher, he has not yet openly reciprocated.

For years, Atom Smasher cherished his role in upholding Pratt's legacy and constantly sought to prove himself worthy to his Golden Age idols - especially when many of them became his teammates in the JSA. But when Albert's mother was murdered in a plane crash engineered by Kobra, he became consumed by vengeance. Not long after the fatal crash, Albert - with the aid of Metron of the New Gods - went back in time and replaced his mother with a weakened Extant, saving her life but murdering the supervillain.