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Old and young go head to head for the fourth series of Bear Grylls epic survival show. With just the clothes on their backs and a handful of basic tools, which generation has what it takes to survive when pushed to the limits of human endurance?

The young group's campsites turns into a swamp in the rain. They join up with the orders but immediately there's a row. Freddie kills a snake, and Kaggy goes on a turkey hunt.

With the old and young living side by side, the islanders hope to hit their stride. But hunger and frayed tempers lead to bust-ups as the islanders turn on one of their own.

The islanders face mother nature at her most violent and brutal. Having endured a series of torrential downpours which have ravaged their campsite, unknown to them a hurricane is brewing 100 miles to the north.

After four weeks on the island, the group have collectively lost almost 30 stone. Can Aran and Jacqui make a killing with a dangerous caiman crocodile and provide food for all?

Bear Grylls examines how the two groups from different generations survived their five weeks as castaways. Was it the wisdom of age or the energy of youth that proved most valuable?

Bears drops the 16 castaways in caiman-infested mangroves and deep water. The two teams soon meet, and it quickly becomes clear that the island isn't their biggest challenge, at the prospect of living together kickstarts a class war.

After a class war on the Pacific desert island, the wealthy and less well-off teams go their separate ways and set up two camps at opposite ends of the same beach.

In search of much-needed food, Barnes decides to risk strong currents and riptides on a journey by raft to a nearby island. But the voyage has disastrous consequences.

After three weeks on the island, the castaways are malnourished. Still living at opposite ends of the same beach, the wealthy and less well-off teams finally put their differences aside in a joint hunting expedition.

Facing their last week of isolation, the two camps decide to settle their class issues and battle the high seas, in a joint bid to raft to the neighbouring island. Can they bury their differences before Bear arrives.

Bear Grylls arrives on the island eager to get the stories behind the castaways' class war and their often dubious survival strategies.