2/6 The Doctor and his companions are on board an Earth ship trapped with the Sensorites.
1/6 The TARDIS lands inside a spaceship orbiting the planet Sense-Sphere.
4/4 Tlotoxl prepares to make his move and have Barbara, the Doctor, Ian and Susan sacrificed.
3/4 The Doctor and Ian try to find a way back the TARDIS. Barbara attempts to distract Tlotoxl