<Tr> <Td_colspan="2"> Next → Season 2 </Td> </Tr> <Tr> <Td_colspan="2"> List of Supernatural episodes </Td> </Tr> <P> The first season of Supernatural, an American fantasy horror television series created by Eric Kripke, premiered on September 13, 2005, and concluded on May 4, 2006 after 22 episodes . 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 . During their travels, they use their father's journal to help them carry on the family business--saving people and hunting supernatural creatures . 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 . This is the only season to air on The WB Television Network, with all subsequent seasons airing on The CW Television Network, a joint venture of The WB and UPN . </P> <P> 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 . Overall, the season averaged about 3.81 million American viewers . The season gained many award nominations, among them two Primetime Emmy Awards for work done on the pilot episode . 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 . </P>

When was the first episode of supernatural aired