"...It all started out as a mild curiosity in the junkyard and
now it's turned out to be quite
a great spirit of adventure..."
STORY PLOTLINE
The TARDIS arrives on board a spaceship in orbit around a planet called the Sense-Sphere. The alien Sensorites have trapped the ship's human crew, Captain Maitland, Carol and John, in a state of semi-permanent paralysis.
When the Doctor investigates, the aliens steal the lock mechanism from the TARDIS, thus trapping him and his companions.
