Can one secret agent keep their cover or will they be discovered.

Can one secret agent keep their cover or will they be discovered.

Castaways receive a much-needed visit from their loved ones, and one castaway must snatch an idol in plain sight.

Tribes drop their buffs and switch things up, and one castaway rubs their new tribe the wrong way right before an explosive tribal council.

Castaways drop their buffs and merge for a big feast, and the first individual immunity is on the line.

One player finds a secret advantage with a special twist, and concentration is key in the individual immunity challenge.

Castaways battle to win individual immunity and earn a spot in the final five.

Alliances are put to the test and castaways question who will remain loyal.

The castaways battle to prove which group has what it takes to win -- Heroes, Healers or Hustlers. Also, one tribe will earn an advantage when the game is immediately "ignited" by the season's first challenge, and there is a super idol that comes with a new twist.

One castaway struggles to keep his head in the game at a tough reward challenge, and a tough physical immunity challenge weighs heavily on castaways.

One castaway's romantic feelings for another tribemate may cause them to spill secrets, and another castaway's lack of social skills could prove to be a problem.

One castaway is upset after being kept out of the loop on a crazy blindside. Also, lack of food takes a toll on another castaway.

Two castaways find a clue and begin searching for a coveted idol. Also, one castaway's annoying behavior could jeopardize their game, and romance is in the air for one pair of Healers, on Survivor.

Castaways compete in an all-new immunity challenge, and a new twist is unleashed into the game. Then, one castaway will be crowned sole Survivor and awarded the $1 million dollar prize, on the two-hour season finale.

The castaways reunite to discuss the season. Jeff Probst hosts.