This is the first in the Big Finish range of Classic Doctor Who audio stories, and great things were to follow.
Dr. Who works superbly well as an audio production, mainly because the production team are no longer hamstrung by cheap visual effects. The monsters are so much better when you cannot see them! Also, as no sets are needed it allows for a much wider and imaginative selection of location, and is able to produce stories with epic, sweeping qualities that just cannot be made for TV.
Following the format of the classic show, adventures are usually 4 part with 25 minutes per episode. In this adventure we are presented with one episode each starring Peter Davison, Colin Baker and Sylvester McCoy, in their individual dealings with the main villain of the piece. Then finally in the fourth episode the three come together to battle it out with their foe. This is where it gets really interesting, and the interaction between the three leads is excellent.
Cast and production crew were still finding their feet, but nonetheless this is good start. The three leads slip back into their roles easily, and after a few minutes it is as if they had never been away. Great stuff.