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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.