Doctor Who

Season 18, Episode 11

Episode Title: Full Circle (3)

Air Date: 1980-11-08

Overview:

Infection from a spider bite causes Romana's personality to change. Meanwhile the Doctor, after discovering that the spaceship society is in a perpetual state of repair and upgrade, has morality issues with the ship's leading scientist who readies himself to perform gruesome experiments on the live marshchild while it's fully conscious.