Helena

Helena was brought up in the Ukraine. She was raised by religious zealots who knew of the illegal cloning program. They taught her that she was an original among them and needed to kill all the others. She's the one who killed Katja. Here's the twist: She is Sarah's twin. And like Sarah, Helena is able to get pregnant and does. She's currently carrying twins. Having been captured and tested on by a religious group who believe genetic biology is God's will, Helena forges a closer friendship with Sarah and the other clones.