IAN: That could be caused by an unsurpressed motor. IAN: (To the Doctor.) The Sensorites may try to prevent you from leaving. (He leads Susan plus Ian and Barbara who are standing in the middle of the room over to the TARDIS.) DOCTOR: Perhaps it's coming from inside the TARDIS. BARBARA: The Sensorites? (The ship begins to rumble and shake. CAROL: The Sensorites! The Sense Sphere almost fills the screen then falls to the side. IAN: Barbara! The Sensorites made our decisions for us. CONTROL ROOM
(Maitland is cutting the left-hand door with a small drill, watched by the Doctor, Ian and Carol.) IAN: But what about Barbara and Susan? The Sensorites have arrived...)
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.