An argument raises questions about loyalty; the Red Berets show tribe members how to best use the camp's resources.

Sixteen men and women attempt to persevere through weeks of challenges to become the final survivor in Thailand. In this episode: The castaways are caught off guard by a new twist.

A castaway has a painful encounter with a stingray during a group swim; there's a shocking offer at the reward challenge.

The members of a secret alliance begin to suspect the others know their secret; argument over truthfulness; odd behaviour raises eyebrows.

The survivors assume the two camps will merge into one; a castaway adopts a new strategy and is accused of disloyalty; the seventh person is voted off.

Helen and Jan get lost while searching for a water source.

Tensions rise and accusations fly between the men and women of one tribe; the tribes compete in a reward challenge for food.

One castaway gets disgusted with others' hygiene; possible alliances explored; funeral for a chicken; the eighth castaway is voted off.

Rebuffed by a former ally, a castaway hatches a new strategy by enlisting support from new sources; the 12th person is voted out.

The sole survivor steps forward to claim the $1 million prize.

News from home might impact a castaway's future; an infiltrator is recruited; the ninth castaway gets ousted.

Ted expresses his feelings about being targeted at the Tribal Council; castaways take on a four-stage obstacle course for their reward challenge.

Highlights from the first 10 weeks and fresh footage, including Ghandia posing for Ted, Sook-Jai's boat sinking and Clay complimenting Erin's butt.

A reward challenge takes the castaways by surprise, evoking tears of joy for the winner; the 11th person is voted out.

The 16 survivors recount what life was like on the rugged island of Koh Tarutao off the southern coast of Thailand