A long time ago, two travellers came from far away...

In the perfumed palace of an omnipotent Sultan, a girl must tell stories to keep the man she cares about from a cruel and horrible death. She spins tales of distant lands she has visited with a mysterious traveller, of fabulous creatures and fantastic adventures – and of a blue box that can travel in time and space.

Meanwhile, in the dungeons below the throne room, there lurks a secret which will bring down the kingdom – perhaps even the universe.

Can the Doctor and Nyssa escape from this never-ending story before the final chapter spells their end?