Season 6

Bhutan is the setting for the first in this new series in which a zoologist, a primatologist, a cameraman and a science writer attempt to find evidence of the mythical Yeti. After spending days hacking their way through inhospitable terrain, the group find some unfamiliar hairs in the hollow of a cedar tree. Is it a Yeti? Is it a rare species of bear? Or is it a grown man floundering around the undergrowth in a big woolly suit?

Well beyond the realm of the surfer dudes of Newquay - or even California - is an elite group whose life mission is to ride the biggest wave imaginable. Off the coast of Hawaii, it's so big that surfers have to be towed by a jet-ski to get on it, as paddling would kill you. Nicknamed Jaws, it doesn't look much on its own, but a sense of perspective dawns when one of the adrenaline junkies pits himself against it. It can go up to 80 feet (the average wave is 10) and a wrong move can be lethal. One of the group tries it for the first time, and he's lucky to get away with shredded knee ligaments.

In 1923 a Canadian doctor Davidson Black discovered fossilized remains in China that helped to prove the evolutionary link between apes and humans. The fossils later vanished, and now archaeology lecturer Dr Wang Tao and Black's grandson are attempting to determine what became of them.

When an Oxford-trained academic goes in search of South American forest magic, talking plants and a shaman who could guide him through hallucinogenic experiences, is he just mad or is there really a mystery waiting to be uncovered?

Dr Erika Hagelberg tries to make contact with tribes on the Andaman islands in the Bay of Bengal and solve the mystery of their origins.

A Canadian fur trapper and an English ex-patriate investigate sightings of mysterious large felines roaming the British countryside.