From the foggy landscape, a dragon's head appears. It lunges at the camera but is quickly shackled at the mouth, averting its threat. Then another dragon head appears and that, too, is chained and subdued. We think the threats are over, but then we see a third head approach from below. It raises its head, opens its mouth and lets out a bellowing screech, but it is not chained. As the camera pulls back we see that this is actually a Hydra, a multi-headed menace with one creature unrestrained, free to wreak havoc.