Jenova

Jenova is an alien calamity that fell onto the planet Gaia 2000 years before the events of Final Fantasy VII. Referred to as "Mother" by Sephiroth, and his remnants Kadaj, Yazoo, and Loz, Jenova's influence in FFVII makes her the primary antagonist. Experiments on her cells, mainly performed by the Shinra Electric Company, have produced many of the games antagonists, including Sephiroth.