|Edition: || US (DVD)|
|When: ||June 2013|
|Format: ||2 x DVD|
Professor Keller has created a machine that can pacify even the most dangerous of criminals. But when the Doctor and Jo arrive at Stangmoor Prison for a demonstration, things start to go horribly wrong — especially when they discover that the Doctor's old enemy the Master is responsible for the machine.
What could he possibly want from the criminals? And what connects him with an impending World Peace Conference?
DVD EXTRAS INCLUDE:
- Audio Commentary with actors Katy Manning (Jo Grant), Pik-Sen Lim (Chin Lee), Fernanda Marlowe (Corporal Bell), director Timothy Combe, producer Barry Letts, script editor Terrance Dicks and stunt arranger Derek Ware, moderated by Toby Hadoke
- The Military Mind Making Of shot in 2009 with cast and crew including Nicholas Courtney and Barry Letts (22 mins)
- Now and Then Film locations revisited (7 mins)
- 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 'television factory' (24 mins)
- Photo Gallery (5 mins)
- PDF materials: Radio Times Listings, 1971 Kellogg's Sugar Smacks promotion
- Production Notes Subtitle Option
- Digitally remastered picture and sound quality
Originally transmitted January 30 — March 6, 1971