This is one of those stories that gets knocked in fandom as not being very good but I must disagree with that view. The story is tight and hangs together pretty well for being a six parter. The acting is very good from both the regulars and guest cast. The picture quality is from restored NTSC tapes and, while some problems remain, the picture quality is much better than the old VHS version I had from a PBS broadcast I taped in the early '80's. As usual with Doctor Who dvd's, this one is packed with special features.