Scot Pollard

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

A castaway retrieves an idol from great heights; two castaways in the beauty tribe become friends; a taxing physical challenge could lead to immunity and rewards.

In a new twist, two immunity idols can be combined to form a super idol; one contestant finds a creative way to retrieve an idol while another struggles to find one.

When the severe heat of Kaoh Rong takes a toll on the castaways, one of them is medically evacuated.

The castaways change things up in a tribe switch.

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.