A giant hippo bull – king of the world’s largest population of these huge land mammals – has an incredible story to tell. For the most part, his story takes place largely hidden from human eyes, under the water’s surface and under cover of darkness. Wildlife filmmakers Lianne and Will Steenkamp record the patriarch’s life, from helpless newborn to unbridled ruler of his territory. Containing previously unseen footage, the film paints a dramatic yet sensitive portrait of the hippopotamus.