Castaways hover on the "Edge of Extinction" in an all-new twist, and four returning players attempt to bond with their new tribemates. Also, castaways tackle a giant puzzle in their first immunity challenge of the season.

The first castaway is stranded all alone on "Edge of Extinction". Also, first-time players band together in an attempt to get a returnee out of the game.

Teamwork is the key to success in an all-new immunity challenge. Two castaways attempt to get along while trying to survive on the "Edge of Extinction".

Castaways drop their buffs and switch things up. The Edge of Extinction heats up when an eliminated castaway has to face people they blindsided.

The castaways' mental toughness is tested on the Edge of Extinction, and targets begin switching from one castaway to another when weaknesses are exposed.

Alliances are tested after a highly anticipated merge between tribes. One castaway wins the first individual immunity challenge of the season.

The puppet master attempts to pull the strings on other castaways, and one castaway struggles to find balance at an immunity challenge after exhaustion takes its toll.

Tribal Council heats up, and castaways strategize until moments before the vote. Concentration is key at a classic immunity challenge.

Two tribal councils in one hour, and a surprise advantage may pay off for one castaway's game.

Another blindside could be in sight after alliances start to crumble. Also, one castaway comes out on top after a crucial immunity win.

One castaway gets caught red-handed rummaging through someone's bag at camp. Castaways battle to win reward in the form of love when family members pay a visit.

Spirits are lifted when castaways living "on the edge" read letters that they wrote to themselves before starting this adventure. Also, the final 7 castaways battle for immunity during a tough puzzle challenge.

One castaway's game unravels and someone gets a chance to return to the game when the castaways "living on the edge" compete head to head. In the end, one castaway will take home the million prize and earn the title of Sole Survivor.

The castaways reunite to talk about their experiences.