In his book, The Hero with a Thousand Faces, Joseph Campbell has pointed out a common pattern in the plots of many mythological stories. The story of Gilgamesh largely fits this pattern, as do some stories about Heracles and Dionysus. The similarities show us what, in myth, is the nature of the hero. Here is a list which includes the major components of the pattern:
1. Separation or Departure
2. Trials and Victories
3. Return