'Just how technologically advanced are they?'
The Doctor frowned. 'Let me put it this way: they have a non-aggression pact with the Time Lords.'
The Doctor has taken his companions to paradise, or at least the closest thing he can find. A sun enclosed by an artificial sphere where there is no want, poverty or violence.
While Chris learns to surf, meets a girl and falls in love with a biplane, Roz suspects an alien plot and Bernice considers that a Dyson Sphere needs an archaeologist like a ...