Lord of the RIngs - Gandalf vs Balrog (Crisp 480p)

Joseph Campbell, a famous scholar of Mythology, wrote a book called "The Hero with a Thousand Faces." He says that the most common of all ancient myths is the "hero myth" in which a heroic figure faces death and danger on behalf of his people, and even dies or descends into a places of darkness in order to conquer evil. What are examples in  religions of the hero myth?

Here is a modern form of the hero myth taken from Lord of the Rings ...