Dean Winchester's character development in the TV show Supernatural is heavily influenced by events that occurred both before and during the show. His childhood and family history play a major role in shaping him into the selfless protector he becomes. When Dean was a child, his mother was tragically killed by a demon, and his father, consumed by the desire for revenge, became obsessed with hunting.

Despite the sacrifices and hardships he faced, Dean's main priority was always protecting his younger brother, Sam. This remained true throughout the entirety of Supernatural, even in his final act before his death. The show begins with the iconic line, "Dad's on a hunting trip, and he hasn't been home in a few days." This is the moment where viewers are introduced to Dean Winchester. However, his story actually begins before this. Dean was already 26 years old during the pilot episode, and fans spent fifteen years getting to know him throughout the course of the show. While the events in the show play a significant role in Dean's character development, it is crucial to remember that his story truly starts before the show even begins. Dean's life before the tragic fire that changed everything for the Winchester family was relatively normal. His mother, Mary, came from a hunting background but wanted a different life for her children. She was engaged to John Winchester, a marine, and they were planning a future together. However, a demon killed Mary's parents and threatened John's life. In order to protect him, Mary made a deal with the demon, agreeing to let it take something from their home in ten years. They lived a happy life together, with Dean and a baby brother named Sam.

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