A group of strangers lives together in a house packed with cameras and microphones recording their every move. Completely cut off from the outside world (except for the lovely Julie Chen), they compete in challenges and pursue prizes. Each week, one ``houseguest'' is voted off. Season six's twist is that friends, co-workers and significant others play the Big Brother game as secret duos. Each secret team believes that it is the only pair in the house. If they can keep their secret and are the last two people in the house, the winner receives $1,000,000, the biggest cash prize in Big Brother history, and the second-place finisher takes home $250,000. If a twosome does not make it to the final two, the winner gets $500,000.