The Power of Three got an overnight viewing figure of 5.49m, even though the figures were down, Doctor Who was the second most watched programme on Saturday night after the X Factor (8.2m).
Professor Brian Cox had this to say about his cameo in the episode:
I have been a Doctor Who fan for a long time - from Pyramids of Mars and The Hand of Fear onwards, with the great Tom Baker and Elisabeth Sladen. I am also a huge fan of Matt, so it was a tremendous honour to be part of one of the great institutions of British television.
Alan Sugar has said:
I have watched Doctor Who for over 40 years and I was flattered when they approached me to make a cameo. It's an honour to be appearing in such an iconic programme, not to mention the street cred it gives me with the grandkids.