Metadoctor

An unnamed man is a scientist who used Livewire energy to create super-soldiers with the same abilities.

Biography
By his order, Lisa Gold and another accomplice kidnap Livewire from prison. He endowed them with the same abilities as hers, after which he ordered the attack on the Police Department in order to show that the soldiers he created are able to defeat even the Supergirl. Later it turned out that he had put the same experiment on himself and gained the same abilities for electrokinesis, thanks to which he was able to catch the Guardian and Mon-El, who tried to save Leslie. However, the Supergirl arrived later and nevertheless released Leslie, after which she wanted to kill the doctor, but Kara persuaded her not to do this, promising to give her some time for the odds of escape.

Powers

 * Meta-human physiology: As a result of his experiments with electricity with Leslie, he augmenting her physiology and allowing her to access her abilities.
 * Electrokinesis: The man is able to control and siphon electricity, as well as to transform into electricity.