5 discs, 13 episodes, and digital bonuses! It's almost as if this could have been a DVD audio release.... Disc 1 contains "Mission to the Unknown" which sets up the rest of the story, and also contains a wealth of digital goodies. PDF files of all of the narrative voiceover scripts, as read by Mr Purves, before and after MP3 files demonstrating the audio restoration AND 13 further MP3 files of each of the complete episodes (without the voice-overs). Just about the only thing missing is some sort of text or audio documentary on the restoration process, and/or interviews from any of the actors (Mr Purves, Mr Courtney, etc) who are still around. Perfect for listening to in a car stereo however as it certainly makes commuting go by easier, and one almost wishes one would get stuck in traffic so as to let the episodes keep playing!