A fun if somewhat simplistic narrative. It packs an impressive amount of content into what is essentially two half an hour stories, and the robot antagonist, who has been driven mad by psychic voices in his mind, calling for him to kill people, is a pretty fascinating character.

Paul McGann and David Tennant give two of their strongest audio performances here also, as they perfectly evoke their respective incarnations. It's just a shame they couldn't find a way for them to meet up, and experience the audio's plots together.