series UFO. The incidental music was performed by a four-member ensemble. It is largely electronic and was produced with an electric guitar and accordion, a vibraphone and an Ondes Martenot, the last of which was played by series composer Barry Gray himself. It was recorded on 23 July 1967 in the same studio session as the music for "The Launching". "Lunarville 7" was the first episode of Captain Scarlet to be produced featuring the lyrical version of the series' ending theme music (performed by The Spectrum), which was recorded on 26 July 1967. Reception Chris Drake and Graeme Bassett regard "Lunarville 7" as a good episode of Captain Scarlet. Writer Fred McNamara praises the episode, calling it an "enjoyably solid, moody affair". Though he believes the mystery to be undermined by some of the dialogue – White's announcement of a new installation in the Humboldt Sea, followed by the Controller and Orson secretly plotting against their Spectrum visitors, making it obvious that the Mysterons have infiltrated the Moon long before it is confirmed on screen – McNamara sums up "Lunarville 7" as a "comfortably confident package whose slower pace allows time for its individual elements to shine". He particularly commends voice actor David Healy's performance as the Controller, the substantial role of supporting character Lieutenant Green, and the design of the Mysterons' lunar outpost, describing it as a "spellbinding bit of visual pulp". Discussing the incidental music, Mark Brend writes that the episode features "one of [Barry Gray's] most fully realised predominantly electronic compositions". He praises the music's "evocation of the cold, desolate expanses of the Moon", calling it "impressive". Andrew Pixley and Julie Rogers of Starburst magazine view the "rather nasty karate blow" that Blue lands on Orson during the Spectrum officers' escape from the Moon as one of the series' more violent moments. The British Board of Film Classification certifies the episode U, noting that it contains one "mild" instance of violence. In a discussion of the presentation of Moon politics in science fiction, writer Stephen Baxter points to this episode – in which the Lunar Controller repeatedly asserts the Moon's independence and neutrality – as an example of how "even juvenile portrayals of lunar colonies can hint at political complications." Paul Cornell, Martin Day and Keith Topping, authors of The Doctor Who Discontinuity Guide, cite "Lunarville 7" and its follow-up, "Crater 101", as influences on the 1969