Shortly after surviving the perils of Logopolis, Castrovalva and the machinations of the Master, the new Doctor and his new crew could be forgiven for wanting to take a breather from their tour of the galaxy. But when the TARDIS lands in a strange and unsettling environment, the urge to explore is irresistible... and trouble is only a few steps away.
The world they have found themselves in is populated by a wide variety of the strangest people imaginable - a crashed spacecraft here, a monast...