The popular CBS reality show returns for an 11th round of voyeurism and psychodrama, as 12 strangers live together in a specially outfitted house where their every move is caught on camera. This time around, they compete as members of groups based on high school cliques -- the athletes, the popular kids, the brainiacs, and the off-beat group. As an added twist, a 13th mystery houseguest will join the contestants, giving an added advantage to one of the cliques. One by one a houseguest is evicted by his or her peers, until the last houseguest standing takes home the $500,000 prize. This season's house is eco-friendly in the extreme, and the houseguests will be made aware of the amount of waste they generate and will be required to recycle.