Photograph: Sophie Mutevelian/Bad Wolf/BBC Studios
Finally, we discover the identity of the mysterious woman who has been appearing with the Doctor and Ruby all through this season’s adventures, and it turns out that Susan Triad (Susan Twist) has been a pawn all along. It was also very amusing that a lot of things that had been the subject of frenzied online speculation – was S Triad an all-too obvious anagram of Tardis? – were dealt with in the first couple of minutes, with everybody standing around essentially saying to the viewer “Well … obviously!”
This was very much the act one set-up of a two-part story. Mel (Bonnie Langford) had far more to do than she did when she returned for the 60th anniversary, and having her undercover in the Triad technology company was a good way of illustrating how Unit utilises the Doctor’s former companions once their travels have ended. Kate Lethbridge-Stewart (Jemma Redgrave) again flashed some of the anger and disgust we saw when she rejected Ruby Sunday (Millie Gibson) in 73 Yards.
