This is another where I have many answers, but I ultimately choose The Mind Robber. I have seen this story more times than most other Doctor Who stories. I love books, and word games, so of course I would fall in love with this story. Also I think how they wrote around Frazer Hines (Jamie)'s chicken pox, is extremely brilliant. I also love the Master (not The Master, though), I thought he was great. That is all I have to say about that.