Premise: 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 required to recycle and made aware of the amount of waste they generate. Episodes air Sundays, Tuesdays and an eviction show on Thursdays (live in the East, delayed in the West). Julie Chen hosts.