With minimal supplies, a wrestler, a plumber, a fitness model, a former Marine, a nurse, and an ultra-marathoner face a gauntlet.

Ripped from their first location, participants must start over in another extreme ecozone; Luke battles caimans for supremacy of the wetlands; Lindsay searches for water in 105-degree heat.

The second location takes a mental toll; Lindsay makes a fateful decision; caimans hunt Luke in the wetlands; Shon's struggle for food pushes him to the brink; Adam fails to make fire and suffers the consequences.