Daleks' Master Plan. The episode's draft script was titled "Dalek Cutaway", while the rehearsal script received the name "Mission to the Unknown"; the names were alternated and combined in different internal documentation, and the final title has been the subject of much debate. Casting and filming "Mission to the Unknown" was unique in that it does not feature any of the main cast or the TARDIS— the only serial in the show's history not to feature the Doctor at all—a decision made partly to save money on their fees. Despite not appearing in the episode, William Hartnell was still credited for portraying the Doctor, while Maureen O'Brien and Peter Purves received credits in Radio Times as Vicki and Steven Taylor, respectively, but not in the episode itself. Jeremy Young, who played Lowery, had previously starred as Kal in the first Doctor Who serial, An Unearthly Child. He acted in "Mission to the Unknown" while rehearsing for his role as Macduff for Macbeth at the Edinburgh Festival, and was excited to working with Hartnell again but disappointed when he discovered his absence. Robert Cartland, who played Malpha, had been recently hired by Martinus to provide the voice of the Rills in Galaxy 4. The Dalek voices—provided by regular actors David Graham and Peter Hawkins—were pre-recorded in Lime Grove Studios on 4 August 1965. The episode was Richard Hunt's first on Doctor Who as set designer; he made the jungle design, while series veteran Raymond Cusick on the rocket and message launcher, made both from stock set elements and by Shawcraft Models. For the Daleks' conference room, Cusick was inspired by the Nuremberg rallies. The episode used stock music composed by Trevor Duncan. Pre-filming for "Mission to the Unknown" took place on 25 June 1965 at Ealing Studios; the scene in which Garvey mutates into a Varga plant was recorded on 35 mm film. Rehearsals for the episode began on 2 August 1965 at the Territorial Army Drill Hall on Uxbridge Road, and the episode was recorded in Studio TC4 of the Television Centre on 6 August. The final scene of Galaxy 4 was recorded alongside the episode to avoid both hiring Barry Jackson and erecting the set; the scene was later inserted into Galaxy 4 during editing. Four of the Dalek props from The Chase were used in the episode. Recording for "Mission to the Unknown" cost . Reception Broadcast and