Today's "Villain of the Day" is
A humanoid model of Cylon
--an advanced android bent on the destruction of the human race. With drop-dead looks and a perfect body, her every move and gesture is smooth and precise, her eyes keenly intellilgent. Six posed as a corporate spy and carried on a long-term affair with Dr. Gaius Baltar, in order to gain access to the designs of the Twelve Colonies defense systems and disable the Colonial military. Thus allowing the Cylons to successfully attack the Twelve Worlds and annihilate most of humanity.
Six is cold and calculating, her every move a cunning means to an end. She has implanted a memory chip into Baltar's brain, allowing her to be ever present and teasing as he flees the Cylons with the Galactica and the last of humanity. She remains visible only to him, a constant reminder of the lustful treachery that resulted in the deaths of billions.
Number Six is extremely religious. In contrast to the colonists, she believes in a monotheistic God, whom she identifies as Love. She claims that God talks to her... and she, in turn, talks to Gaius Baltar. She has prompted Dr. Baltar to accept God's existence, and to accept that he is an important part of God's plan or will.
Number Six can, like other of the new twelve models of cylons, retain memories and be downloaded into another body if the original body is damaged. Like her counterparts, her body was designed to mimic the human body at cellular level making them almost undetectable to testing procedures. Instances of Number Six have expressed sympathy and regret over the destruction of the colonies, and have also claimed to be in love with Baltar. Her intentions and loyalties are also unclear. She has vastly helped humans by pointing out a Cylon bomb to Baltar on Galactica and helped him build a cylon detector, yet she also expresses enjoyment over what she considers the inevitable extinction of the human race.
Did I mention she's damn sexy?
Not just physically... attitude as well. I love the evil ones.