Kali is one of the most notorious of the Hindu pantheon. As the unamiable consort of Siva, she needs to be calmed by her husband to keep from destroying the world. Christian missionaries accused her of encouraging human sacrifice, but her real mission was the destruction of the demons that hold humanity back from enlightenment. For this reason, Kali has become a key figure in Tantric worship. What makes Kali so fascinating and what does she have to teach us about staving off apocalypse?