Through advanced computer graphics, location shooting and expert interviews, we will present detailed illustrations of what these ancient monsters looked like, where and how they lived, and how they died. We'll see how most species were wiped out during one of the five major extinctions in Earth's history...when the chemistry of the entire planet was altered by impacts from a comet, an asteroid, and eruptions of super volcanoes.

We'll also learn how palaeontologists discovered these creatures, and how they make sense of the record they left behind.