Davina McCall, Rylan Clark-Neal and special guests relive the first ever series and the dramatic moment that made Big Brother an icon

Davina and Rylan relive Celebrity Big Brother 4, when secret civilian Chantelle Houghton went into the house pretending to be a celeb!

Davina and Rylan remember Nikki Grahame's Diary Room rant in Big Brother 7, one of the most iconic and often-quoted Big Brother moments of all time

Davina and Rylan relive the unforgettable duet between Ulrika Jonsson and Verne Troyer during a task in Celebrity Big Brother 6

Davina and Rylan remember the moment when Jackie Stallone made a shock entrance to the Celebrity Big Brother house with her now iconic catchphrase

This episode re-joins the action in the CBB4 house to hear George Galloway utter those eternal words to Rula Lenska: 'Would you like me to be the cat?'

In BB3, which kicked off the careers of Alison Hammond, Kate Lawler and the late Jade Goody, the action builds to a shock twist: the house is split into rich and poor sections

From Ivana Trump entering the house to Alex Reid destroying a snowman at the command of a persuasive talking tree - it could only be CBB7

Davina and Rylan relive one of Big Brother's simplest yet most entertaining tasks. Which BB6 housemate can stay in a cardboard box for the longest?

The final episode in our countdown is from Big Brother 2. Romance unfolds between Helen and Paul - and Helen tells us how much she likes blinking!