S1, E5: This episode focuses on the new giants, the heavyweights of the dinosaur world. It’s only in recent years that we’ve unearthed the biggest dinosaurs that ever lived. One monster eclipsed all others, more than seven times as heavy as Diplodocus this was the immense Argentinosaurus – a single backbone was bigger than a human. For years these giants were considered immune to attack from any predator – until the discovery of– Mapusaurus – a new giant killer whose fate appeared to be inextricably linked to Argentinosaurus.