This was a really good episode. I really liked how it twisted to virtual reality at the end. It also explodes that the doctor is not at his prime, he is usually enough to by himself to defeat any contender he has faced without arms or even his screw driver or a plan. As he requested to the alien that wanted him to kill Missy, there is evidence he can suffice at killing so manny without nothing more than his willingness… But this time he is blind, deprived of one of his main senses, could he stand to the challenge?, also who could be this alien race capable of VR? So far I haven’t seeing any race that advanced as the time lords… Excellent episode, I want to see what is next!