"Lunarville 7" is the 15th episode of Captain Scarlet and the Mysterons, a British Supermarionation television series created by Gerry and Sylvia Anderson and produced by their company Century 21 Productions.
Set in 2068, the series depicts a "war of nerves" between Earth and the Mysterons: a hostile race of Martians with the power to create functioning copies of destroyed people or objects and use the reconstructions to carry out specific acts of aggression against humanity.
Earth is defended by a military organisation called Spectrum, whose top agent, Captain Scarlet, was murdered by the Mysterons and replaced with a reconstruction that later broke free of their control.
The first part of a story arc that concludes in "Dangerous Rendezvous", "Lunarville 7" sees Scarlet, Captain Blue and Lieutenant Green investigate a lunar colony after its controller unexpectedly declares the Moon a neutral body in Earth's conflict with Mars.
After the Spectrum trio hand over the President's letter, Orson agrees to take them on a trip in a Moonmobile, a vehicle that uses the Moon's low gravity to jump and glide over the lunar surface.
[7][9] "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.
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".
[8] 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.