The official Doctor Who site says that "CBBC eXtra - the children's red button service - are running a Doctor Who competition from Friday. The main prize is the first season DVD Box Set, a sonic screwdriver with psychic paper and a TARDIS mobile phone flasher. There are runner-up prizes of a Doctor Who audio mug and TARDIS keyring. There will also be a preview of the DVD including some clips from the first series and a look at some of the special features. The competition will run for seven days starting on Friday. All viewers will have to do is answer a simple question to enter."Click here for further details.