Jensen Ackles by Sergei Bachlakov/ The CW Jensen Ackles by Sergei Bachlakov/ The CW

"The season opens with some bombshells!" teases Supernatural creator Eric Kripke, who already jolted viewers when he sent Dean Winchester (Jensen Ackles) to Hell in May's season finale. Season 4 (premiering September 18 at 9 pm/ET, The CW) opens four months later, when Dean wakes up with no memory of his torment. "What happened to Dean in Hell and to [younger brother] Sam [Jared Padalecki] when he had to be a hunter by himself will slowly come to light," Kripke says. "It gives us a nice opportunity for an internal struggle for Dean and for the brothers to surprise each other." Katie Cassidy (Ruby) and Lauren Cohan (Bela) are both gone, but Jim Beaver and Steven Williams are back as geezer demon fighters Bobby and Rufus. Get set for a revealing flashback to the Winchester parents' teen years, an homage to 1930s monster flicks and a bloody Halloween show. - Ileane Rudolph