Paleontologists seek evidence to determine which of the three competing theories - kill, chill or ill - best account for the disappearance of all the large animals at the end of the last ice age.

The world millions of years ago: The dinosaurs were extinct, now new, fascinating giants are populating the earth. A twelve-meter-long giant boa and the ancient rhinoceros, which weighs several tons. Scientists from all over the world are compiling the latest findings about the prehistoric giants. Using modern CGI technology, they bring the extinct colossi in the documentary to new life. Will they manage to solve the final puzzles surrounding the mysterious giants? Central question: Why did the giant animals become extinct? The anaconda and today's rhinoceros are the closest living relatives that provide scientists with information about the behavior of the prehistoric giants. Fossil remains, the examination of important excavation sites and the latest digital technology provide a fascinatingly comprehensive picture of the life and death of the prehistoric giants. (Text: ZDF)

In ancient times: the dinosaurs are extinct. They are followed by two more spectacular prehistoric giants: the 20-meter shark Megalodon and the elephant-sized sloth Megatherium. Using modern CGI technology, international scientists draw a picture of the life and death of the prehistoric giants in the documentary. Their basis: current fossil discoveries, the latest findings and the family relationship to the great white shark and today's sloth. Central questions: What factors were decisive for the extinction of the giants? What role did competition for food, the appearance of the first humans and changing climate play? Do today's giants of the animal world face similar challenges? The journey to the “giants of prehistoric times” provides answers and unlocks their final secrets.