In a punishing Brazilian savannah, survivalists Wes and Jesse deal with searing heat as well as paralyzing wasps, aggressive bees, and poisonous rattlesnakes. But a territorial jaguar family circling their shelter may cost them the 21-day challenge.

Dropped into Guyana's scorching savannah, two super fans battle the oppressive heat and relentless insect attacks; scorching temperatures lead to severe dehydration and force a desperate fan to risk illness by drinking unsanitary fluids.