When reclusive millionaire Marcus Gold announces that he's staging an "Iron Teen" competition on his private island in the Outer Hebrides, Ben, Lizzie, Will, Grady and Carmen sign up. They'd be mad not to when the prize is one million pounds ... each. But when the competition commences, the group begin to regret their decision - this is no ordinary contest. Other teams are hunting their competitors and attacking them. As the pressure intensifies and their survival instincts kick in, the friends struggle to stick together. Who can they really trust?