Castaways get the biggest reward of the season with surprise letters from home. Then, balance and dexterity are tested at a crucial immunity challenge to guarantee a spot in the final six.

Castaways' spirits are drowning in a relentless rain storm, but a fun challenge reward offers a few players a glimpse into the Cambodian culture. Also, the "voting block" strategy used this season continues to keep Castaways on their toes.

It's every castaway for themselves, as two tribes become one in this season's merge. Meanwhile, one castaway's thirst for power could earn them a spot on the jury, and jaws drop as the blindside streak continues.

An intense water challenge leaves castaways thirsty for a much-needed reward. Also, immunity hangs in the balance as castaways attempt to steady themselves, and a shocking Tribal Council takes an unexpected turn.

When the castaways discover that two people will be sent packing in a rare double elimination, everyone scrambles to save their own skin, and one castaway surprises everyone and risks it all at Tribal Council.

With the end in sight, castaways scramble to solidify a plan for the final three. Also, a frightening incident at the Immunity Challenge sends shockwaves through the entire tribe, and castaways are rewarded with a spiritual recharge at the temples of Cambodia.

One castaway must do damage control after being called out by their tribe. Also, balance is tested in a stressful immunity challenge.

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

Reunited on the merged tribe, two old friends rekindle an alliance but trust doesn't come easily, and one castaway makes an unprecedented play, setting the stage for one of the most surprising Tribal Councils in Survivor history.

An accident threatens one castaway's future in the game.

Twenty winners of "Survivor" return to compete against one another for a prize of $2 million.

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

Sixteen contestants arrive on the Pearl Islands to discover that the competition has begun, and they must race to find supplies.

A surprising turn of events at Tribal Council sends shock waves through the entire tribe. Also, castaways must choose between food, love or an advantage in the game.

A power struggle between castaways erupts, and each player tries to arm themselves with allies. Also, tensions rise when castaways from Gen X turn on each other and one castaway throws another under the bus to build trust in the game.

A dramatic twist in the game sends shockwaves through the tribes. Also, castaways are flying blind at a classic immunity challenge.

A quarrel between two castaways could mean the end of a showmance. Also, castaways who win rewards earn a much-needed trip to the burger bar!

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

The remaining six castaways must get the ball rolling to win the reward challenge and earn a sweet treat. Also, castaways will need to hang in there during the immunity challenge to secure their spot in the final five.

Castaways must roll their way to a win in the immunity challenge, leaving the rest at risk of going home. Then, a comment from day one comes back to haunt one of the castaways.

Twist catches the tribe members off guard; castaways contend with the curse of the Pearl Islands; a castaway makes a monumental decision.

Desperate for friends and allies, one castaway sacrifices immunity in order to stay in the game. Meanwhile, another castaway has made promises to too many friends, forcing an alliance betrayal at Tribal Council.

In one of the most physical reward challenges ever played, injuries threaten to send two castaways home before the first challenge is completed.

Loose lips sink ships when one castaway's frustrations put a wedge between them and their tribe; a shared meal breeds connection between tribemates as they discuss race and heritage.

One tribe member dupes his fellow castaways with a shocking lie; a castaway is accused of sabotaging the tribe's food supply.