Al Rothstein (Earth-2)

About:
Albert "Al" Rothstein, also known as Atom-Smasher, was one of the many induviduals affected by the particle accelerator explosion on Earth-2. Al used his powers to become a meta-human mercenary and presumably fought with "Jay Garrick".

Al was unwillingly forced to Earth-1. Zoom then promised him that he could be brought back to Earth-2 if he killed The Flash but before Al did this he first went on and killed his Earth-1 doppelgänger because he was afraid of Zoom and if he failed he could take his Earth-1 doppelgänger's place.