Wildlife adventure series following a team of explorers in the heart of the tropical island of Borneo - a lost world of unexplored jungle protected by a fortress of impenetrable mountains. Their aim is to find evidence that will help the area to be preserved forever. The team begin by setting up camp and searching for the elusive clouded leopard and the rare Borneo gibbon.

The humidity and parasites are starting to take their toll as one team begins searching for jungle elephants. Meanwhile, the mountaineers are lost on a remote mountain peak.

The explorers have a close encounter with a giant python and one of the team is bitten by a deadly coral snake, but there's a major breakthrough as they go in search of wild Orang Utan.