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 to escape and run loose on Earth. She is one of the two main antagonists in the second half of season 1 of Supergirl.

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

Trivia

 * Indigo is portrayed by Laura Vandervoort who played Supergirl in Smallville.
 * She is an amalgam of Brainiac and Mystique.
 * Indigo is similar to Ultron from Avengers: Age of Ultron:
 * They are super-intelligent androids who seek to destroy humanity.
 * They are able to transport themselves via, and even control, the Internet.