Indigo

Indigo is an alien android cyberterrorist that attempts to wipe out the human race. Formerly known as Brainiac 8 she is associated with Braniac 1, the one that Superman often fights.

She has a history with Non and as the prisoner of Fort Roz that helped Kara make it out of the Phantom Zone and is also the one who allowed all Alien prisoners in the prison escape and run loose on Earth. She is a minor turned true secondary antagonist in season 1 of Supergirl.

She was torn in half by J'onn J'onzz and she seemed to deactivate while Supergirl stood over her.