This is so good. There’s an amazing moment in part four where the Doctor attends what turns out to be Li H’sen Chang’s final stage performance. We know that Chang intends to kill the Doctor, and the Doctor’s also got a pretty shrewd idea that’s what he’s planning. Chang brandishes a pistol as part of his stage act. Earlier, we saw him load it. Is he planning to kill the Doctor in an “accident?” Just to press home the point, without blinking, the Doctor moves the target closer to his own face. You can hear a pin drop.
The whole story is just terrific. The direction, the design, and all of the performances are as good as you could get in 1977. It’s even better than I remembered it.