place in Snape, Suffolk around the River Alde from Monday 18 September 1978 to represent the marshes featured in the script. Nine days of location filming were afforded to the serial, including two night shoots, more than is usual for a Doctor Who story. Studio sequences were taped during October 1978. The serial was directed by Norman Stewart, who had directed the Underworld story a year previously. This was his final assignment on the programme. The actors playing Swampies were coloured green with a special water-resistant dye ordered from Germany. Unfortunately, the make-up artist failed to order the special dye remover, with the result that many of the actors had to take chemical baths to get the green dye off, and many had a green tint for a long period after production was finished. Costume designer Colin Lavers introduced a new tweed coat for the Doctor, which sported four flying duck brooches on its lapels. Around this time, producer Graham Williams fell ill and his duties were taken on by Anthony Read and production unit manager John Nathan-Turner, assisted by Blake's 7 producer David Maloney. Cast notes Among the cast were a number of actors who had previously appeared in Doctor Who playing other characters. The most notable of these was Philip Madoc who had previously appeared in The Krotons (1968–69), The War Games (1969) and The Brain of Morbius (1976). He had initially been invited to play Thawn, but the role was given to George Baker, who then pulled out. Madoc agreed to play the part of Fenner when Alan Browning, who was slated to play Fenner, fell ill before the start of production, but was dissatisfied with the role. John Leeson, best known as the voice of K9, appears in this story as Dugeen. This is his only on-screen appearance in Doctor Who and was given the role due to the fact that K9 doesn't appear in this story. (The role had previously been offered to Martin Jarvis.) Neil McCarthy previously played George Barnham in The Mind of Evil (1971), while John Abineri previously played Van Lutyens in Fury from the Deep (1968), General Carrington in The Ambassadors of Death (1970) and Richard Railton in Death to the Daleks (1974). Broadcast and reception Part One was broadcast only a few hours after BBC1 had come back on-air following a strike. The channel had ceased transmitting programmes after the