A team of scientists and filmmakers explores the jungle wilderness of New Guinea. The team are based at the foot of Mount Bosavi, a giant extinct volcano covered in largely unexplored rainforest. With the help of trackers from a remote tribe they aim to search for the animals that live there, and they make amazing finds, including the nest of the world's smallest parrot, and new types of frogs, geckos and bats.

The team push deeper into the rainforest, and enlist the help of a tribe to find and film the extraordinary birds of paradise as they perform their bizarre courtship displays. Meanwhile, George McGavin has to manhandle a giant crocodile.

George McGavin travels east to an erupting volcano and discovers a rare bird that depends on the hot ash for its survival. Sudden explosions bring the trip to a quick halt as giant boulders crash into camp.