The CW have attempted 2 Supernatural spinoffs. Bloodlines in season 9.
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And, more recently, Wayward Sisters. But both were passed up.
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It's inherently difficult to have a Supernatural show without Sam and Dean.
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But next season will be Supernatural's last, and this could benefit a possible future spinoff.
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For one, the spinoff wouldn't need to compete with the main show.
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And viewers upset about Supernatural ending will have something to fill the void.
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Additionally, the spinoff's story wouldn't be restricted by the main series.
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