It's a battle of the sexes when tribes are separated into men versus women, but they are in dismay when they learn of a game-changing twist - they must share one beach. Meanwhile, castaways are shocked when a tribe's true colors are revealed at a competitive Immunity Challenge.

Castaways jump off the deep end in an Immunity Challenge that requires a delicate balance. Meanwhile, a group of misfits band together, finding an unlikely leader.

Weathering the harsh elements sparks new battles between the sexes, and poor communication leaves castaways scrambling at a frustration-filled Immunity Challenge.

An unforgivable betrayal forces one tribe to make a drastic move that has never been done before in Survivor history, and an electrifying Tribal Council leaves several castaways speechless.

It's no longer men versus women when a new tribe of "Greek Gods" emerges, and two castaways shake up their entire tribe with an award-winning performance.

Extreme pain threatens to derail one castaway's chances of staying in the game.

Corks fly and celebrations commence following the tribal merge.

The game gets personal when one tribe member is confronted about her physical appearance, and a shocking blindside eradicates any sense of security in the Tikiano tribe.

Temptation is sweet for ravenous tribe members vying for Immunity, and rumors of a Hidden Immunity Idol send Tikiano into a tailspin as they head into Tribal Council.

Castaways go on the attack when one tribe member forces a confrontation, and a heartfelt message from home brings the Tikiano tribe to tears.

Castaways oil themselves up for a wet and wild Immunity Challenge. While the lucky winners enjoy a picnic vacation, Tikiano's sore losers strike at the chance to powwow at camp, and feelings of alienation drive leery tribe members to seek out all the elimination options.

Walls come down when the Tikiano tribe shares an emotional moment with their loved ones, and one castaway's decision creates animosity amongst wounded tribe members.

An unlikely betrayal within an alliance puts one castaway on the defense, while another tribe member concocts an elaborate story to gain an advantage in the game.

For the first time, an all-women Final Five battle for the title of Sole Survivor, and one castaway breaks down before the Final Tribal Council.

The 18 castaways reunite to discuss the season.