Immunity challenges get interesting when a new idol is introduced that has a special twist.

Castaways stumble upon a sneaky advantage that comes at a great risk.

Two castaways strategize a risky move during the immunity challenge, and another castaway does what it takes to earn a tribemate's trust.

Ua, the tribe of only three castaways, competes to win the immunity challenge to save them from becoming a tribe of two. Also, friendships are put to the test when castaways from different tribes take a journey together.

For 12 days, the Luvu tribe has avoided going to tribal council, but now that the three tribes have merged, their alliances will be tested. Also, there's a new twist when it comes to the merge.

Castaways compete in their first individual immunity challenge in the game. Also, Erika has been on Exile Island for two days, where she must make the biggest decision in the game thus far.

The castaways must work to make amends after betrayals; an interesting turn of events takes place at the reward challenge.

A castaway is singled out for their dishonest game, making a clear distinction where the line has been drawn. Also, in tonight's challenge, immunity and reward are on the line.

After a grueling season with no food, a warm meal is up for grabs at the reward challenge, and the immunity challenge will be a test of focus and balance.

Another big twist threatens to send someone home, and castaways must formulate a plan whether to vote out the big threat or keep playing the game with people they trust.

Castaways need to alter their plans after the winner of the immunity challenge throws a wrench in their next big move.

After a dangerous season filled with new twists, only five castaways remain and must battle is out for the title of Sole Survivor and the $1 Million prize, on the two-hour season finale of SURVIVOR followed by an after show hosted by Jeff Probst.