Watch Animal Face-Off: Hippo vs. Bull Shark (2004) : Full Movie Online Free Ever wondered what would happen if two of the world's largest animals went head to head in a battle? The Animal Face-Off series aims to find out. After expertly designed replicas of the animals are created to mirror exact areas of strength and weakness, the two cyber-creatures come together for a crucial showdown. In this episode, the hippopotamus and the bull shark duke it out for bragging rights within the animal kingdom.