Kinda and Snakedance, both are pretty complex stories but clearly Christopher Bailey wasn't a TV writer and the stories worked better in the novels than their televised verisons. Kinda also suffered from production problems especially the snake at the end. But the stories did give Tegan something to do and the Mara and the Great Mind's Eyes were in a way analog versions of the Krell machine. Two Halloween stories, The Brain Of Morbius which still is an execellent gothic horror story base of course on Frankenstein. And The Curse OF Fenric which is a pretty complex story too, I saw the episodic version this time but the movie version is pretty good too although the music cues are different in the movie version, the story ends up being better in the long run.