The 2006 series finale `` Army of Ghosts '' \/ `` Doomsday '' saw another squad of Dalek survivors from the old Empire , known as the Cult of Skaro , led by a black Dalek named `` Dalek Sec '' , that had survived the Time War by escaping into the Void between dimensions . The 2006 season finale `` Army of Ghosts '' \/ `` Doomsday '' featured a squad of four Dalek survivors from the old Empire , known as the Cult of Skaro , led by a black Dalek named `` Sec '' , that had survived the Time War by escaping into the Void between dimensions .