Al Rothstein (Earth-2: Pre-Crisis)

"Well, this is a curveball. I thought I was going to have to come looking for you. I'm not gonna let you hurt anyone else. I'm only here to hurt you, buddy."

- Atom Smasher and The Flash

Albert "Al" Rothstein also known as Atom Smasher was the first Metahuman of Zoom's Gang to be sent to Earth-1 to confront The Flash