Following the Doctor’s regeneration into a younger body, the TARDIS lands on Vulcan, where the Doctor is mistaken for the Earth Examiner.
The Doctor discovers that Lesterton is attempting to revive three inanimate Daleks that were found in a crashed ship.  The Doctor’s warnings go unheeded, and once reactivated, the Daleks start performing routine tasks around the colony.  However, they have sinister plans of their own.