Naked and Afraid: Alone

Trying to survive 21 days completely solo, All-Star survivalist Luke McLaughlin takes on the dangerous wilderness of South Africa.

All-Star survivalist, Gary Golding, takes on the Belize jungle alone. He bonds with a turtle called Timmy, but an infection threatens his challenge.

Surrounded by lions and hyenas, All-Star survivalist Lacey Jones is isolated, vulnerable and sleep-deprived as she takes on the African bush.

Survivalist Ryan Holt is solo in South Africa. Having eaten contaminated fruit in his XL challenge, he vows to only eat meat -- if he can kill anything.

Constantly on the run to avoid territorial rhinos, elephants and lions, survivalist Max takes on the punishing African Savannah.

In the Bulgarian mountains, packs of wolves and boars stalk all-star survivalist EJ Synder. Alone and without fire, he is an easy target for predators.

All-star survivalist Ky struggles in the Amazon rainforest. He faces swarms of mosquitos, blood-thirsty piranhas and caiman-filled waters.

As darkness shrouds the jungles of Belize, Kim Kelly is utterly alone. She's surrounded only by torrential downpours, infuriating ticks, and howler monkeys.