Zoom

"Zoom" is a speedster from Earth-2.

Early life
Almost nothing is known of Zoom's history or even his real name, but what is known is he first appeared on the Earth-2 radar around the same time that Jay Garrick/The Flash acquired his Speed-Force powers and went on to become the prime enemy of Jay, killing hundreds of people. The Flash spent most of the 2 years of his career tracking Zoom with little success, with each speedster seeking to destroy the other.

One night, the two had their biggest battle, where they raced throughout Central City as The Flash fought hard to keep up with his incredibly fast demonic foe. Eventually, Zoom gained the upper-hand atop a tall skyscraper and began phasing his hand through the Flash. Before Zoom could finish off the helpless Crimson Comet however, a huge portal in the sky opened and The Flash was sucked into it and brought to Earth-1 while Zoom, still on Earth-2, raced away.

Targeting Flashes
Somehow gaining access to to Earth-1 Zoom learned of the existence of Barry Allen/The Flash and grew to despise him too just for having speed powers also and vowed to kill him. Zoom came into contact with Al Rothstein/Atom-Smasher from his world, who'd also somehow come through, and offered him the chance to return home if he killed The Flash.

Shortly after Atom-Smasher's defeat, Zoom returned from Earth-2 with Eddie Slick/Sand-Demon and also with him offered to bring him home if he killed The Flash.

Some time in 2016, Zoom had an encounter with Barry that caused him to miss the funeral of a person close to himself and Oliver Queen.

Powers

 * Speed Force connection/Meta-human physiology: Zoom draws his powers an unknown source. He can absorb other speedsters' speed, as he did to Jay, which possibly further amplifies his own speed.
 * Superhuman speed: Zoom can move extremely fast and might be the fastest speedster in all of existence according to Jay Garrick, who himself, is capable of moving at near-light speeds, something neither Barry Allen nor Eobard Thawne have yet demonstrated.
 * Electrokinesis: Like all speedsters, Zoom generates a powerful electricity from his body and can use it in any way he chooses. While at super-speed, the electricity that radiates off him is sapphire blue as opposed to the normal yellow or red exhibited by previously-seen speedsters like Barry, Jay or Eobard.
 * Interdimensional Travel: Zoom is able to travel between Earth-1 and Earth-2. It´s currently unknown what means he employs to do so, although it´s likely an effect of his unmatched speed.

Abilities

 * High-Level Intellect/Master Tactician/Manipulator: According to Jay Garrick, Zoom is extremely intelligent. He outsmarted Jay, who possesses an equally sharp mind, multiple times for over 2 years and the latter claims that he always seems to be one step ahead. Zoom is also able to manipulate powerful metahumans such as Atom Smasher or Sand Demon to do his bidding, under the promise of returning them to their world afterwards.