Two superfans battle heat and insect attacks in Guyana's savanna.

Two super fans train before attempting a full 21-day challenge.

Two sets of identical twins are dropped in the African savanna.

A survivalist with dwarfism tries to prove himself in the Amazon.

Two fans face relentless insects and aggressive sharks in The Bahamas.

When a third survivalist is added to the mix, romantic complications make surviving the Colombian jungle's poisonous dart frogs and deadly jaguars more complicated. Feeling left out, a survivalist's emotional breakdown puts his challenge at risk.

All-star survivalists Trent and Sarah take on the brutal jungle of Mexico.

Two strangers face the dangers of Africa in the dead heat of summer.

Two people battle thunderstorms and dehydration in the Bermuda Triangle.

Two survivalists return to seek redemption in the Mexican jungle.

A Canadian mountain man joins an experienced homesteader in the desert.

In a unique four-person challenge, a lion attack survivor returns to Africa to face her fears. Surrounded by lions, crocodiles and cape buffalo, the tribe struggles against constant threats and each other as they try to survive in a kill zone.

An earthquake in the Philippine jungle rattles two competitors.

Superfans Molly and Nate are dropped deep in the Amazon rainforest, a place that's taken down the best of the best. Nate and Molly lean on lessons learned from their couches to push through torrential rain, relentless bugs, and sleep deprivation.

A biker and a taxidermist have to stay on the move to survive in Africa.

A couple takes on the challenge in the Philippine jungle.