22 years later, while attending Stanford University, Sam is forced back into the paranormal world by Dean, who has come to tell him that their father is missing. When they were children, Sam (Padalecki) and Dean Winchester's (Ackles) mother Mary ( Samantha Smith) died a violent and unexplainable death, which in turn led their father, John Winchester ( Jeffrey Dean Morgan), to teach them hunting skills in search of the creature that took her life. viewers in millions' refers to how many Americans watched the episode live or on the day of broadcast. In this table, the number in the first column refers to the episode's number within the entire series, whereas the number in the second column indicates the episode's number within this particular season. The episodes are also available through digital retailers such as Apple's iTunes Store, Microsoft's Xbox Live Marketplace, and 's on-demand TV service.

Although the season was split into two separate releases in Region 2, the complete set was released on October 2, 2006, and in Region 4 on October 2, 2007. The first season was released on DVD as a six-disc box set on September 5, 2006, by Warner Home Video in Region 1.

The season was internationally syndicated, airing in the United Kingdom on ITV, in Canada on Citytv, and in Australia on Network Ten.

While some critics did not like the mostly anthology-like format, others praised the show for the emotional moments and noted the brotherly chemistry between the lead actors. The season gained many award nominations, among them two Primetime Emmy Awards for work done on the pilot episode. Overall, the season averaged about 3.81 million American viewers. The first sixteen episodes of the season aired on Tuesdays at 9:00 pm ET in the United States, after which the series was rescheduled to Thursdays. As of 2019, Supernatural is also the only continuing series that originated on The WB, and by far the longest running show ever to have aired on that network with over 300 episodes produced. This is the only season to air on The WB, with all subsequent seasons airing on The CW, a joint venture of The WB and UPN. Jared Padalecki and Jensen Ackles star as Sam and Dean, with Jeffrey Dean Morgan recurring as their father, John, and Nicki Aycox as the demonic Meg Masters. During their travels, they use their father's journal to help them carry on the family business-saving people and hunting supernatural creatures. It focuses on brothers Sam and Dean Winchester as they track down their father, John, who is on the trail of the demon who killed their mother and Sam's girlfriend. The first season of Supernatural, an American dark fantasy television series created by Eric Kripke, premiered on September 13, 2005, and concluded on May 4, 2006, after 22 episodes.

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