The Doctor, punished by the Time Lords, has been exiled and force to regenerate. However something has gone wrong and he is now in the Crystal Empire. Now he must work on getting back to his own universe while helping the Empire against an old enemy.

Set in an alternative season 6B of Doctor Who. (Between The War Games and Spearhead from Space) so the Doctor will be in his third persona/ regeneration/ personality (the Jon Pertwee one).