Audio commentary by actors Nicholas Courtney and John Levene, producer/codirector Barry Letts and script editor Terrance Dicks
Can You Hear the Earth Scream? - 34 minute "Making Of" featurette
The Unit Family-Part One - 35 minute featurette
Visual effects promo film
Deleted scene
Pertwee years intro to episode 7
PC-ROM feature - 1971 Doctor Who annual and Radio Times billings
Production note option
Photo gallery
Easter eggs
Digitally remastered picture and sound quality
2 - Disc Set
Audio: DD2