SEASON RETURN: This indefatigable CW series, which began as a WB series way, way back in 2005, had its final Season 15 run cut short, with seven episodes yet to be televised. They finally start showing up tonight, with the expanded series finale scheduled for next month. And if you don’t remember, back when the CW broadcast the previous episode of Supernatural, what the hell the Winchester brothers were up to, don’t feel bad. Neither do I. But I do remember that, in their c