THE DOCTOR IS CONCERNED: THE TARDIS HAS landed but the instruments indicate it’s still in motion. The scanner screen reveals nothing but static, which the Doctor suspects is caused by a magnetic field.
Venturing beyond the safety of the TARDIS, the Doctor, Ian, Barbara and Susan discover they are aboard a vessel travelling through space. Two of the crew are held in suspended animation by the apparently hostile Sensorites, denizens of the Sense-Sphere – the planet around which the ship presently orbits. The other crew member lives apart on the ship, having become unhinged by the aliens’ mental assaults.