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Part 1: The Conquerors: For hundreds of millions of years, animal life resided only in the oceans. And then, in one extraordinary event, something happened that enabled one group of animals to emerge from the sea. Follow scientists as they track how the shape of life transformed to create the animals that led the first successful land invasion and were the first to pioneer flight. Part 2: Survival Game: To survive, all animals rely on incredible offensive and defensive strategies. Octopus, squid, cuttlefish and snails -- all mollusks -- evolved from the same animal design. How did the struggle for survival lead to such different variations? What secrets do they reveal about the survival game?