Mankind's innate compulsion to acquire knowledge often leads those seekers down some very dark paths, a truth that has played a part in many stories written and handed down over the centuries. The Season 3 finale, "Mad Scientist," looks at horror movies in which men and women of science unleash dangerous forces they cannot anticipate, films such as "Frankenstein," "Altered States," "Dr. Jekyll and Mr. Hyde" and even "The Rocky Horror Picture Show." Interviews include Geena Davis, Bryan Fuller, Dana Gould, Meat Loaf and Quentin Tarantino.