Zoom (Arrowverse)

"Heroes die."

- Zoom to Barry Allen Zoom is the primary antagonist of season 2 in the CW TV Series, ''The Flash. ''He is a powerful interdimentional evil speedster from Earth-2 and the arch nemesis of super hero Jay Garrick.

Past
Not much is know about Zoom or how did he got his powers, however, he apparently became Zoom around the same time that Jay became The Flash/Crimson Comet, the two eventually fought against each other several times. During one of these fights, Jay was about to get killed by Zoom until a singularity appeared on the sky, fortunally saving Jay but bringing him to another reality know as Earth-1.

Two Flashes
After entering Earth-1 by unknown means, Zoom began to kidnap meta-humans from Earth-2 such as Al Rothstein aka Atom-Smasher and Eddie Slick aka Sand Demon in order to kill the two Flashes, both Atom-Smasher and Sand Demon were defeated and killed.

Trivia

 * Zoom is currently the fastest speedster on the show, even proving himself to be faster than Barry Allen's arch-nemesis, Eobard Thawne. The fact that he is the true "fastest man alive" was even confirmed by Jay Garrick himself during the episode, Flash of Two Worlds.