Zack Snyder's fans demanded that his vision be set free from meddling studio execs and the gun-for-hire director who replaced him on 'Justice League', and Warner Bros. listened. Was it worth it? And Fiona and Ben descend down a dark path of exposing institutional corruption, in the Oscar-nominated investigative documentary 'Collective', the second season of true crime series 'Exposed: The Ghost Train Fire', the hit British police procedural 'Line of Duty', and 'Infernal Affairs' among other must-see Hong Kong flicks available on SBS On Demand.