‘I’m afraid one of us is deluded about geography.’ The second of Christopher H Bidmead’s scripts sweeping away the last of the 1970s and setting up the era of the fifth Doctor, Castrovalva (1982) encodes contemporary ideas in an antique setting. This Black Archive considers fictional and studio spaces, created worlds and people, the architecture of labyrinths and the influence of such figures as Jorge Luis Borges, Douglas Hofstadter and MC Escher, before asking, ‘What does the Master want?’.