I have watched Doctor Who beginning in the 70's. I always loved the Master and was worried how they would bring him back. But, my apprehensions were put to rest with this episode. This Doctor Who series (all 3 of them) have been updated for a new audience. I had watched John Simm in "Life on Mars" and was a little tentative of his being cast as the Master. Stupid me - he is FANTASTIC! Finally a match for the Doctor of this series - witty, cocky ... and his opposite - totally lacking in sympathy & insane. Oh, and I got the pleasure of seeing the US President being disintegrated - just what the present incumbent, George Dubbya, deserves for what he has wrought on this earth. This is my favourite episode of the new incarnation of Doctor Who. Absolutely fabulous!!