Czarnians

Czarnians are a species known to visit Earth.

History
After a Dominator appeared in National City, only to be fought by Supergirl, her blind D.E.O. allies asked whether her enemy was Czarnian.

Behind the scenes

 * In the DC comics, the Czarnians are a near-extinct species bent on universal domination, which the antihero Lobo belongs to.