Doctor Who The Sensorites

The Doctor Ian Barbara and Susan arrive in the TARDIS on board a spaceship Their initial concern is for the ships 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