Over the millennia, thousands of creatures have developed that most sophisticated of biological and chemical weapons: venom. Chemicals that can scramble your brain signals, paralyze your muscles, puncture blood cells, and even begin digesting you from within. But nature's most destructive and extreme killer toxins could also contain the keys to a new generation of advanced drugs that could treat heart attack, stroke, diabetes, Alzheimer's, and cancer. NOVA follows scientists on a dangerous quest to track down, capture and sample the wares of the world's most venomous animals - not just to find out how they kill us, but how they can save us.