As the series' first season comes to a close, twins Ang and Ling continue to battle on opposite sides. The evil Zodiac Master summons the Emperor of the Darkest Yin, spelling doom for Ang. Will Ling continue to support her dark master? And what will happen when the twins learn their mother is still alive? The future of the world hangs in the balance as the twins -- representing light vs. dark, good vs. evil -- face off one last time.