Escape from Scorpion Island - Series 2 - Episode 1

Sixteen children between 11 and 13 are marooned on an exotic island thousands of miles from school, friends and parents. They compete to be the first to conquer the island and learn how to escape from it. The teams arrive already split into two groups and once on the Island they spot a helicopter with a cage dangling beneath it. Inside the cage there are 10 other children; are they competitors or part of their teams?