And so Billie Piper leaves the show to be replaced at christmas by Catherine Tate as Donna Nob;e and then for the season proper by Freema Aygeman as Martha Jones.

The Doctor takes Martha on a trip through time and space where she meets Judoon on the Moon, Shakespeare, Macra, Daleks, Professor Lazarus and the Master. There are encounters with Captain Jack, the Weeping Angels and is if that wasn't enough she also has to deal with a human Doctor.

But which is your favourite?