Brian Cox to appear in Doctor Who - Telegraph » The physicist appears in tonight's episode of the BBC sci-fi series when he is called upon to help explain what is going on when mysterious black cubes start falling from the sky. Despite presenting two highly acclaimed series on the solar system and the universe, Professor Cox is left stumped by the weird events as Doctor Who attempts to solve the phenomenon. He joins the Timelord, played by Matt Smith, and a real lord – guest star Lord Sugar – in the episode, called The Power of Three....
