Brainiac's pawn

In the Aftermath of Superman and Kara's battle with Brainiac, it seemed that the later was completely destroyed. But a piece of his consciousness survived in one of his drones. Now months later, he's strong enough to execute his revenge, infecting Kara directly with a Brainiac nano virus, turning her into the perfect drone. And ready to take down Superman and finally transfer his consciousness into his body.