There is a change afoot at the helm of the CW’s veteran drama series Supernatural. Sera Gamble, who has been with the show since the beginning, serving as co-showrunner alongside Robert Singer for the past two seasons, will be stepping down. Word is that she opted not to renew her contract to focus on development. Jeremy Carver, executive producer/co-showrunner of Syfy’s Being Human, is joining Supernatural as an executive producer and will co-run the series with Singer next season. The CW has not made any formal renewal decisions yet but Supernatural is one of the network’s stronger ratings performers and is fully expected to return in the fall.