The prequel series to Supernatural, The Winchesters, has been officially cancelled by The CW. The network has been cancelling most of its shows, and only two have been renewed so far. The show, which followed the lives of Sam and Dean Winchester's parents, is reportedly being shopped around for a new home. While the cancellation wasn't due to ratings, it does raise questions about the future of the Supernatural universe. The chances of another spinoff seem slim considering the main cast's commitments to other series.