Peter Baggenstos

One castaway has the key to individual immunity and is guaranteed a shot at the final six; a broken alliance may not be able to be restored.

When tribes merge, the alliances change; an immunity challenge keeps the castaways on guard.

One woman tries to direct the female alliance towards targeting a single castaway, but the gesture could backfire on her when the vote is held.

Strategies and alliances are thrown out of whack when an unexpected development throws plans into disarray.

The merger sets off a power struggle between the remaining members of the tribes; an all-girl alliance could cause problems for one castaway.

The castaways must figure out which attribute -- brains, brawn or beauty -- will be the thing that helps them win the most grueling competition yet.