Joseph Campbell was well-known for his exploration of the monomyth, or the hero's journey, which posits that worldwide myths that have survived for thousands of years all share a fundamental structure. Campbell's work inspired George Lucas to create the first Star Wars trilogy. In the mid-1980s, Bill Moyers spent many hours interviewing Campbell at Skywalker Ranch. The result was a now famous documentary called "The Power of Myth." The series has been available on DVD since 2001, but Moyers has just made the full series available for streaming and download on his site.