David Tennant, Billie Piper, Catherine Tate, Freema Agyeman and John Barrowman go through the greatest moments of the Doctor's finest companions.

A temp from Chiswick-turned-saviour of the universe, Donna Noble saw it all - from Planet of the Ood to old Pompeii. David Tennant, Catherine Tate and other key cast share their favourite Donna delights and talk about the most memorable moments of her journey through time and space with the Doctor.