Some hundred million years ago, crocodiles were the ruling T. rexes of the waters. They galloped on land, ambushed prey at the river's edge - even terrorized dinosaurs. These swift predators evolved through the ages into the modern crocs we know today. Now, armed with newly discovered prehistoric crocodile bones, Dr. Paul Sereno is determined to bring the ancient creatures to life - and tell their fantastic untold story. Learn about a croc that pursued prey across land, a supercroc that locked its jaws around dinosaurs, even a croc with a startlingly canine face. Blending art, forensics and biology, a team reanimates a lost world of strange Cretaceous crocs that paleontology forgot.

An investigation into prehistoric, fossilised human remains found in the Saharan Desert.

A team of palaeontologists led by Nizar Ibrahim go in search of Spinosaurus, a giant meat eater believed to be even larger than Tyrannosaurus rex.

Learn about the king of the dinosaurs, the T-Rex. This was the greatest meat-eating machine of the dinosaur era.

Like many great scientific discoveries, this one happens by accident. Sereno, an expert in locating dinosaur fossils, is on an expedition to Niger, in Saharan Africa. Six weeks into a three-month journey, his team makes an unexpected discovery: human bones, the remains of peoples who lived 10,000 and 5,000 years ago.