As Kelly and Marky hunt for medical supplies, the situation in the Big Brother house takes a sudden turn for the worse. Meanwhile, Patrick does something to appall Pippa. Riq and Alex make a startling discovery.

Patrick and Pippa make a desperate bid for freedom. Riq and Alex face unimaginable peril. Joplin thinks he’s worked out what’s happening. And the undead are still arriving...

As huge numbers of undead gather at the studio gates, Patrick, Kelly and the housemates are forced to make some agonizing decisions. Who will survive – and what will be left of them?