This story revolves around our good Doctor recovering from his latest regeneration. Of course, the evil Master wishes to take advantage of the weakened Doctor during this phase. The Doctor attempts to heal within the "Zero" room, which is a recovery room within the Tartus. Unfortunately, the meddling of the Master makes this a daunting task at best. I really enjoyed this story because of the city Castrovalva and the culture that is derived from this make believe race of people. The sets used in this episode were really nicely done and the people and places were believable and fascinating, I found myself almost wanting to visit the city myself. hehe. The Doctor is taken to Castrovalva by the Master who creates this entire city and its people in order to get at the Doctor, which is very very hard to believe, but none the less happens. Tegan and Nyssa do their best to help the Doctor to get into the city where the hope is that he can recover from his regeneration there. All in all I believe you will enjoy this episode as much as I did. There is something very relaxing and enjoyable about the theme of the story and I often find myself playing this tape after a hard and busy day so as to relax and unwind. Its a great night time story for any age. Definately invest in this episode and you will not be sorry. Bye for now friends!