The Merchandise Guide
DVD: Extras
Compiled by Martin Willey

Horizon behind the scenes footage (2m:28)

Clapperboard Two Part Special on Gerry Anderson (restored and edited - to remove non-Anderson material - 38m:56)
2021 Impact Blu-ray only has part 1 (20m:30s)

Unexposed: Behind the Scenes of Series Two - filming The Mark of Archanon. (25m:07s)
In May 1976 a group of film students were given a brief to produce a short film about the making of a television series. The second series of Space: 1999 was then currently in production at Pinewood and the resultant footage includes candid interviews with cast and crew - as well as some unique behind-the-scenes footage of rehearsals and filming on set and in the model shop.

Archive Interviews with cast and crew (29m)
Promotional interviews filmed during production in 1976 with Martin Landau, Barbara Bain, Gerry Anderson, Catherine Schell, Keith Wilson, and Fred Freiberger.
Some versions (2002 TF1) include Brian Johnson interview (below), making 40min; others have Johnson as a separate feature.
The 2005 EMS only had Martin Landau (5min 30) and Catherine Schell (3min 10) with Anderson separately (5m)

Brian Johnson interview (8m:15s)
Note: this is sometimes joined with the archive interviews (above, eg 2002 TF1, 2015 Network) or the Behind the Scenes feature (below, eg 2001 Carlton, 13m:40s)
Network Second Series Blu-ray is shorter at 6m:42s
2019 Shout Factory Blu-ray is trimmed to 3m:21s
There is additional footage on the Space: 1999 Documentary (Kindred, 1996), which has not been released commercially.

Behind the Scenes - Model Shop: footage taken during The AB Chrysalis - with Brian Johnson commentary (6m:35s)
Behind-the-scenes footage taken during filming of The AB Chrysalis - with commentary recorded in 1999 by Brian Johnson.