Mild-mannered forensics expert Dexter Morgan (Michael C. Hall, in an Emmy-nominated turn) continues his double life as a Miami serial killer in the sophomore season of Showtime's dark drama. Keith Carradine joins the cast as FBI agent Frank Lundy, whose investigation may expose Dexter's dark secret. Call him crazy, but there's method in Dexter's madness as more of Miami's worst meet their demises.