Castaway: Redemption Island

Castaway: Redemption Island is the seventh season of Castaway. There were 18 contestants, 9 male and 9 female. A viewing link to the season, complete with cast bios and an episode by episode commentary can be found here.

Story
18 individuals, 9 men and 9 women, mysteriously disappear around a set of two islands inhabiting the waterways between Australia and New Zealand. One of the islands was inhabited by a group of Aboriginal settlers, the other was inhabited by Maori settlers.

9 of the castaways found themselves on the island that once belonged to the Aborigines. Whereas, the other 9 found themselves on the island that had belonged to the Maori people.

The Twist
The twist of the season was "Redemption Island". When a castaway was voted off by the group, they were taken to a secret second island.

Every episode they players on Redemption Island compete in a challenge to keep their opportunity of returning to the game. The winners stay on the island and the losers are sent home for good.
 * In episode 8, Will who was eliminated in episode 3, returns to the game.
 * In episode 14 Part 1, Angel who was eliminated in episode 12, returns to the game.