A look at the complex production of the Doctor Who story Underworld with particular emphasis on the difficulties in achieving the bluescreen virtual studio sets. With script editor Anthony Read, writers Bob Baker and Dave Martin, actors Jonathan Newth (Orfe) and Norman Tipton (Idas), designer Dick Coles and video effects designer AJ 'Mitch' Mitchell, with rare convention footage of producer Graham Williams. Narrated by Richard Heffer.
