The storyline for this episode comes from an idea sent in to a Blue Peter (1958) competition. Apart from brief appearances of a few in the following series, this is the last chance to see the Tucker-era cast.
Final appearances of Linda Slater as Susi McMahon; Mark Eadie as Andrew Stanton; Paul McCarthy as Tommy Watson; Vincent Hall as Michael Doyle and Neil Rogers as his sidekick Robo.
Incidental music includes "Vienna" and "Astradyne" by Ultravox; "The Holly & the Ivy" by Steeleye Span; "Every Little Thing She Does Is Magic" by Police; "Baggy Trousers" by Madness; "Miss You Nights" by Cliff Richard; "Labelled With Love" by Squeeze and "Wonderful Christmastime" by Paul McCartney.
This episode does not appear in its proper place on the Series 3 + 4 box set but is now included as a bonus feature on the Series 7 + 8 DVD box set which was released in 2019 by Eureka!.