The sick people look a little icky – but that’s the point! They look scary at first, but they are not monsters. They are people who need to be cared for!
Rose has her body taken over by a woman with looser morals than she has. So she unbuttons her top button, revealing a bit of cleavage. This lasts for about half the episode.
Who is the hero? A visitor from another world. And, like Christ, the Doctor has a bizarre and inexplicable interest in the welfare of the humans of earth.
What is the problem he has to solve? People are sick and dying and their masters cover that fact up. The cat nurses are a type of devil in this story, convincing their slaves that everything is the way it should be.
How does he solve the problem? He cures them. The transmission of this cure is by touching, so each sick person much touch another to spread healing. Kinda like Christianity! It spreads by lives touching.
What is the product of the hero’s work? A New Earth.