Gavin Whitson

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

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

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.

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

After 39 emotional days, one castaway will take home the $1 million prize and earn the title of Sole Survivor. One castaway’s game will unravel, and someone will get a chance to return to the game, when castaways “living on the edge” go head to head on the two-hour season finale, followed by the one-hour live reunion show.