Comet Hale-Bopp put on a fantastic display for Earth-bound skywatchers for over two years, often considered "the" comet of the 20th century. But, conspiracies and fear marred the event and led to the suicide of 39 members of the Heaven's Gate cult. In this Part 3 of 3 episodes, I discuss the cult's belief system, their suicide, and the continued pseudoscience about Comet Hale-Bopp after their deaths.