While there have been many worlds featured in the fantasy show, Supernatural first confirmed the existence of its multiverse in its later seasons. Since season 1, there have been some big changes in Supernatural to keep the show fresh and entertaining, with villains scaling up each season to deliver a bigger finale, and storylines expanding into unknown territories and organizations like the British Men of Letters. Additionally, there have also been many proposed Supernatural spinoff shows, some of which have been rejected, like the much-anticipated Wayward Sisters, and others that have succeeded in their conception, such as The Winchesters.
