Big Brother bosses are apparently hatching a plan for one future housemate to become a millionaire.

Producers are planning for the final series – in three years’ time – to be a massive ratings hit.

An insider told the Daily Star: “We want to create reality TV’s first ever millionaire – but they’ll have to bitch, bonk and backstab their way to get it.”

Production company Endemol has just signed a new three-year deal to stay at Elstree studios until 2010 – and bosses are hoping for an explosive finale.

According to the insider, they will invite back all the former winners – Craig Phillips, Brian Dowling, Kate Lawler, Cameron Stout, Nadia Almada, Anthony Hutton and Pete Bennett to join them. They also hope all the Celebrity Big Brother winners – Jack Dee, Mark Owen, Bez, Chantelle Houghton and Shilpa Shetty – will also take part in the final show.

The source added: “There are three more years of Big Brother to go and we want to end the run with something sensational.

“We thought it would be fun to bring back all the winners and most talked-about housemates over the year for the grand finale where the ultimate £1m prize is on offer.”

A spokesperson said: “No plans have been made for the final series yet.”