The Military Mind - A look at the making of the story. Featuring actors Nicholas Courtney, Pik-Sen Lim and Fernanda Marlow, director Timothy Combe, producer Barry Letts and script editor Terrance Dicks.
Now and Then - The latest in our long-running series visits the filming locations used in the story to see how they have changed over the years.
Behind the Scenes: Television Centre - Back in 1971, presenter Norman Tozer visited BBC Television Centre to find out what went on over 24 hours in the life of what was then an incredibly busy â€˜television factoryâ€™.
Radio Times listings
1971 Kelloggâ€™s Sugar Smacks promotion
Aired: 24 Jan 2017