The task will see the group splitting into green and blue teams and doing battle in a series of epic challenges for ownership of various areas in the house.
Photo Gallery - Big Brother Day 27:
Copyright: Channel 5Whoever wins each battle will claim ownership of that particular area of the house. The first battle - 'Trolley Dash' - will be for the kitchen, and whoever loses will be banned from that area and forced to live off survival rations in the living area.
The task will culminate in a Diary Room battle and only the winners will be allowed to nominate next week.
Deana Uppal, Conor McIntyre, Becky Hannon and Arron Lowe are the four housemates facing possible eviction this week.
Big Brother airs daily on Channel 5.