(Just having been gently evacuated from a nearby airlock by two friendly Sensorites, the TARDIS crew is able to gaze at the image of a departing rocketship on the TARDIS scanner.) (Slowly the bedraggled figures advance from both directions clutching their stakes, as they begin to realise that the Doctor and Ian are no immediate threat to them. (Susan points to the model.) (The Doctor squints into the tunnel in the opposite direction and notices another figure cutting off any potential escape, dressed and armed in an identical manner to the first.) But how will it help you? EX-ADMINISTRATOR: Yes. FIRST-ELDER: Not by any Sensorite. IAN: Barbara! IAN: The Sensorites, you mean? NUMBER ONE: Yes, the Sensorites. SUSAN: But why kidnap her? We're on good terms with the first Elder, the Doctor's discovered an antidote for the poison and now he and Ian are tracking down the cause of the trouble. Who are these people?
Plan: A: The Doctor; Q: Who travels to the Sense Sphere to cure an illness? A: Susan; Q: Who communicates with the Sensorites? A: the TARDIS; Q: Where do the Doctor, Ian, Barbara and Susan arrive on board a spaceship? A: the ship's human crew; Q: Who is suffering from telepathic interference from the Sensorites? A: an attack; Q: What do the aliens fear from the humans? A: the Sense Sphere; Q: Where is the Sensorites' planet? A: deliberate poisoning; Q: What is the cause of the illness that the Sensorites and Ian have succumbed to? A: another threat; Q: What does the political manoeuvring of the Sensorite City Administrator pose to the TARDIS crew? A: the TARDIS crew; Q: Who is the Sensorite City Administrator trying to discredit and implicate? Summary: The Doctor, Ian, Barbara and Susan arrive in the TARDIS on board aspaceship. Their initial concern is for the ship's human crew, who are suffering from telepathic interference from the Sensorites, but Susan communicates with the Sensorites and finds the aliens fear an attack by the humans and are just defending themselves. Travelling to the Sense Sphere (the Sensorites' planet) the Doctor seeks to cure an illness to which the Sensorites and Ian have succumbed, but finds it has been caused by deliberate poisoning. The political manoeuvring of the Sensorite City Administrator poses another threat to the TARDIS crew as he seeks to discredit and implicate them.