The story of the beginnings of all animal life using innovative camera techniques and computer animation. This series celebrates the splendors and struggles of evolution, unveiling eight biological designs which are the underpinnings of nearly all animal life. -- Episode 3. The first hunter: Follows an unlikely predator, the bizarre and vibrant flatworm, whose hunting and sexual exploits forever altered the shape of life. -- Episode 4. Explosions of life: In a geologic instant, a fantastic array of animals emerged on earth laying the groundwork for the incredible diversity of life that exists in the world today.

Contains episodes 3 & 4 of an 8 part series. Originally broadcast as an 8-part series on PBS television.