Joseph Campbell studied myths and legends from around the world and discovered that heroes in these stories all experienced similar journeys. He described this recurring archetype as "The Hero's Journey," which involves 12 stages: the hero leaves their ordinary world after receiving a call to adventure, crosses a threshold into an unknown world of trials and temptations, faces their greatest challenge/enemy in an ordeal, overcomes a crisis, receives a reward, and returns home a changed person who can navigate both worlds.