Supernatural is an American fantasy television series. Here is the narration of first episode of first season.

         The story starts with Mary Winchester waking up and checking on her youngest child, Sam. She finds a figure in there standing over Sam which she believes is John Winchester, her husband. She walks downstairs and finds John, sleeping in front of the TV. She runs back upstairs Soon after, John hears Mary screaming and rushes into Sammy's room, where his wife is attached to the ceiling, bleeding. A fire starts around her, then the entire ceiling is burning. John rushes in, grabs Sam and runs out and passes him to Dean telling him to run outside the house as fast as he could. He then rushes in trying to save his wife Mary but then realizes that there is no hope for her as the house is already in flames.

          Then 22 years later, John's obsessive path to hunt down the thing that killed his wife. Driving his 2 sons around the country and hunting down ghost stories killing things that are evil. Dean is just old enough at the time to remember his mom and understand his father’s goal. Whereas Sam was 6 years old and doesn't care much about it. Sam had already left the "Family Business" which is hunting evil. Now Sam tries to lead a normal life and make plans for his future.  He has a girlfriend named Jessica. Dean breaks into his house at night to tell him that their dad, John, has been on a "Hunting trip" and hasn't been home in a few days. Sam joins the search for their father and they travel to a small town. The first place they go is the last place they heard from Dad and encounter their father’s previous case.
            The 'Woman in white' who appears on the highway at night and asks unfaithful men to drive her home and kills them. 

              The Winchester brothers investigate the disappearance of local men in the area and also using fake IDs and credit cards find their father's hotel room. We see he has left all his stuff there so he must have been in a hurry. They encounter the spirit of the "Woman in White" have the bridge at night and manage to escape.
          After they figure out who the Woman in White is the cops who were tricked by Dean and Sam, arrest Dean and he gets his dad's journal that filled with all his notes on supernatural lore and he sneaks out of the station, while Sam interviewing the husband of the dead ghost. 

      In short order, they've gotten rid of the woman in white and have a set of coordinates that they hope will lead them to John. Except, Sam still wants to go to his place and attend the interview. So Dean drops Sam back off at Stanford. 

              The boys make a surprisingly good team as they work together. However, he loves Sam enough to let him go. Sam walks back into his apartment. He lays down on the bed, looks up at the ceiling and above him he sees Jessica's body. Sam screams as she catches fire, dying just as his mother did. Dean rushes in and drags Sam out of another burning room. Sam, having lost everything that he thought made his life "normal," gets into Dean's beloved 1967 Impala and re-joins the quest to find the demon that's stolen both of the women he loved.

To be continued…