Dissension forms when a tribe member's plans to form an alliance are overheard; a second contestant is voted out.

Wild animals just outside one tribe's boma present a danger; one tribe member's loyalties are divided.

A member of the Samburu tribe cracks under pressure; age differences continue to split loyalties; a trip to the watering hole becomes a deadly encounter.

When a tribal council approaches, Boran Tribe members fiercely vie in order to remain in the competition.

A tribe member considers turning on a fellow member; tribes begin to theorise on when they will be forced to merge.

After arriving at the immunity challenge, the tribes are shocked to learn that they are merging and they are on their own.

Never-before-seen footage of early trials and tribulations, as the nine remaining survivors vie for ascendancy in the African bush.

Lex becomes determined to discover who cast the second vote against him in Moto Maji; the Samburu tribe tries to gain a member from the Boran tribe.

A last-ditch effort to stay does not work for one tribe member, and only seven remain.

Deadly wildlife moves too close for comfort; the 10th person is voted out of the tribe.

Emotions erupt when the survivors hear from their loved ones; the challenge winner gets to visit the Masai Mara.

The five remaining castaways find an unpleasant surprise awaiting them in their water hole; Lex wins a car and the opportunity to take supplies to a local AIDS hospital in the final reward challenge.

The sole survivor is revealed from among 16 contestants who spent 39 grueling days in Africa enduring scorching heat, deadly wildlife and dehydration.

The 16 survivors gather to discuss their experiences in Africa.

The survivors discuss how their lives have changed since returning to the United States.

One castaway is out for blood after realizing an ally was sent to the Edge of Extinction.

New-school players attempt to take control against the old-school players.

Castaways are on the edge of breaking down when faced with a grueling opportunity.

Tribes drop their buffs and switch things up; tension in one tribe creates alliance opportunities.

The immunity challenge weighs heavily on castaways when two tribes are sent to tribal council.

Some winners sprint their way to an opportunity to gain an edge over the other castaways.

With the old-school players living on Edge of Extinction, it’s merge time for the new-school castaways.

Things get tense for the castaways during a chaotic tribal council; a taxing immunity challenge.

Contestants have moments with their loved ones; the 12th person is sent to the Edge of Extinction.

Alliances threaten to crumble; an undercover operation escalates to new heights.

Alliances threaten to crumble; an undercover operation escalates to new heights.

The remaining seven castaways make their final push toward the $2 million prize.

Winners battle it out, but only one is crowned Sole Survivor and takes home the $2 million prize.