Big Brother contestants will face the biggest twist of the current season and one of the toughest challenges in the show's 13-year history when a new task kicks off next month.
Producers appear to have been inspired by a White Room twist first used in the show's Australian edition, and schedules reveal that a bonus episode titled Big Brother: The White Room will air on Wednesday August 1.
Emma Willis' spin-off will also get a special instalment, with Bit On The Side: White Room Live due to broadcast straight after.
Though no details of the UK incarnation have been revealed, the Australian edition saw a series of wildcard hopefuls locked in a room where everything is white - clothes, food, decor - except for a giant red buzzer in the middle.
Housemates driven to the brink by the challenge could press the buzzer at any time to quit the process, leaving the last remaining hopeful to be crowned a new bona-fide housemate.
Due to the fact that the UK edition is now nearing the end of the current season, it is considered unlikely that unknown wildcard entrants will be used over here - and it is assumed that the current crop of contestants will have to take part.
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