"Supernatural" concluded with its 15th season, which aired its final episode on November 19, 2020. There are no plans for a season 16, as the series wrapped up the story of the Winchester brothers, Sam and Dean. However, there are potential spin-offs in development, but as of now, no new seasons of the original series are expected.

"Supernatural" was not cancelled in the traditional sense; it concluded after 15 successful seasons. The decision to end the series was made by the show's creators and the network, The CW, as part of a planned conclusion to the story. The show's longevity and dedicated fanbase were remarkable, but the creators felt it was time to wrap up the narrative arcs of the characters. The final season aired in 2020, providing a satisfying closure to the beloved series that began in 2005.

One of the most controversial episodes of "Supernatural" is "The Song Remains the Same" (Season 5, Episode 22). This episode faced backlash for its portrayal of certain characters and themes, particularly regarding the depiction of LGBT relationships and the treatment of characters in a supernatural context. Additionally, the episode's handling of time travel and its implications for character arcs sparked discussions among fans about continuity and character development. Overall, it highlighted the complexities of storytelling in a long-running series.

You can watch all seasons of "Supernatural" on several platforms. It's available for streaming on services like Netflix and HBO Max (now known as Max). Additionally, you can purchase episodes or entire seasons on platforms like Amazon Prime Video, iTunes, Google Play, and Vudu. Availability may vary by region, so it's a good idea to check your local streaming services for access.