Sorry, this episode is no longer available to watch on Demand 5.
Find out why
First broadcast at 22:00 20 Jun 2012
The housemates become lab rats as part of Big Brother's latest task.
Lydia celebrates her birthday and Big Brother drops a bombshell.
The results of the latest nominations are announced.
The housemates tackle Big Brother's ticking time bomb task.
Browse all shows
Channel 5 Broadcasting Ltd. 2016