my idea for a sequel/reboot: a few months before Dean's death he slept with a lady he met at a diner. that lady gave birth to a baby girl she named Samantha Winchester. When Samantha grew up she ed a covert government agency that hunts monsters. during a hunt, Samantha runs into Sam's son Dean, during the fighting Samantha asks Dean to the agency. after a while, Dean realizes their dads were brothers.

the show would be like X-files meets supernatural with them traveling around the world to hunt. while still having to do FBI-style things. things.