 Sylvia Anderson thought the voice "marvellously camp" and the recording session "quite hilarious".The carrier aircraft featured in the London Air Display scene was one of the first designs that model-maker Mike Trim contributed to the series.Trim also designed the DOMO (Demolition and Object Moving Operator) – a modified version of the Excavator, which was originally built for "Martian Invasion" and is also seen in "Cry Wolf".