Big Brother 2005 launch: With Davina McCall, Craig Coates, Roberto Conte, Kieron Harvey. 16 people, selected from a national search, share a House sealed from the outside world for 78 days. Watching over these Housemates is Big Brother – heard only via a voice. He is the all-seeing all-knowing authoritarian figure who monitors the Housemates’ every move. Every week Housemates nominate each other for Eviction in a secret ballot. The viewers then vote to decide who will be Evicted. The last person left wins the major cash prize.