Not too long ago, Sam and Dean Winchester seemed to have it all. Mother Mary had returned from the dead, Castiel was living at the bunker, and they were teaming up with frenemies Crowley and Rowena with surprising regularity. And then it was all gone. In the Season 13 premiere of Supernatural, “Lost and Found,” the brothers find themselves alone once more. But there’s little time to grieve because Lucifer’s son Jack is walking the earth as a full-grown man.