The special takes viewers deep into prehistoric waters to explore the ancient ancestors of today's sharks. Using animation, the episode highlights some of the most feared prehistoric ocean creatures, including the Dunkleosteus, the buzzsaw shark (Helicoprion), and the scissor-toothed shark (Edestus).
We rank shows by quality, not popularity. Each genre has its own pool — the best title in each genre scores 100, so a great War film competes against other War films, not blockbusters. A masterpiece in a niche genre can crown its category even if most people haven't heard of it. Learn more →
