An unnamed world, an unknown time. A vast mining vessel trawls a sea of mineral sand for valuable ores, the tiny human crew served by an army of humanoid robots. But as the Doctor and Leela arrive, one of the crew is found murdered... and if they didn't do it, who did?
Quest roles:
David Collings(Vorus), Pamela Salem(Rachel), Russell Hunter(Uvanov), David Bailie(Dask), Brian Croucher(Borg), Tania Rogers(Zilda), Tariq Yunus(Cass), Gregory de Polnay(D.84), Miles Fothergill(S.V.7), Mark Blackwell Baker(Robot), John Bleasdale(Robot), Mark Cooper(Robot), Peter Langtry(Robot), Jeremy Ranchev(Robot), Richard Seager(Robot), Rob Edwards(Chub)