tbug wrote:Oi! Spoilers!
To answer your question, that particular Doctor/companion combination is a favourite of many people (admittedly not me), and its return will possibly bring in some of those viewers who stopped watching between series four and series five. At least, the Beeb presumably hopes it will.
Apologies, it was from the official Doctor Who Facebook page so I assumed it was safe.
And I know why they're doing it, doesn't mean I'm happy about it