The blue planet is full of secrets. Why do whale sharks prefer to gather off the Mexican coast? What does that have to do with the impact of a meteorite? And how could one of the most amazing tropical rainforests be completely forgotten? From the bizarre wildlife of the island of Sulawesi to the fearsome creatures of the Maya to the cloud-covered peaks of Africa - "Our Earth, the mysterious planet" takes viewers on a journey through the continents and their history.