David Vaughan, 39, from Pontypool, in South Wales, joins a Beyonce lookalike, a former soldier who lost an eye and both legs in a bomb explosion, and a London squatter who lost out to Lindsay Lohan for the lead role in Parent Trap.
David claims to have travelled through time and space.
He became a Christian nearly 20 years ago after a period of dabbling with drink and drugs and is the chief organiser of alternative Christian festival, Sloshfest, which encourages revellers to party on a natural high brought on by their belief in God.
The 13 housemates were selected from a pool of more than 80 wannabes and were told of their success during a live TV launch show hosted by Davina McCall last night.
The final series will run for the next 11 weeks and will be followed immediately by another two-week special Big Brother featuring all the winners from the series which has dominated Channel 4 every summer for the last 10 years.
A wild card additional contestant entered the house last night dressed as a mole and will attempt to live there as a "mole" undetected by the housemates.
Other contestants include a Katie Price lookalike, a professional dancer who has backed Cheryl Cole and believes in praying every day, and a Tory-supporting writer and broadcaster who has written for the Mail on Sunday and The Daily Telegraph.SIC: CT