The documentary series brings to life the heavyweights of the dinosaur world, creatures that have only been unearthed in recent years. The 125ft-long argentinosaurus, which roamed South America 95 million years ago, was the creature that eclipsed all others - and remains the largest dinosaur ever discovered. For years, these colossal plant-eaters were considered immune to attack from any predator - until the discovery of new giant killer the mapusaurus, whose fate was inextricably linked to the argentinosaurus