This is an excellent companion set to Walking With Dinosaurs, far more updated of course (yet discoveries are made every day still!), better graphics, but Walking With included Mammals and Amphibians of the age as well, so that series should not be discounted as of yet, anyway. Planet Dinosaur does include Marine Reptiles and Plesiosaurs as well as dinosaurs.
Episode 1 deals with Spinosaurus, bigger and meaner than the famous T- Rex,
Episode 2 deals with the recent bird like dinosaurs,
Episode 3 deals with the T Rex's
Episodes 4 and 5 deal with the marine reptiles and the four legged giants,
Episode 6 deals with the oddities and the mass extinction of everything that weighed more than 40 kilograms.
This series shows how they piece together the theories and the dates of the discoveries as well as the relative size to humans.
I ordered it from amazon.ca and it played on my blu-ray player, people having issues with this should upgrade their players with software available free online.***
***note - The extras disc was in dvd format so it wouldn't play