Dark Matter (Earth-34)

History
Dark Matter is a metahuman from Earth-34.

Unmasked
When Black Flash opened up multiple breaches on Earth-1, many metahumans from alternate Earths came through the breaches and into Earth-1. One of those metahumans was Dark Matter from Earth-34, who fought with Earth-1's Flash, but ended up losing.

Related

 * Appearances of Dark Matter (Earth-34)