6. The Macra Terror - 4/4 Episodes Missing
I remember that when Gridlock featured the Macra in 2007 very few people believed me when I told them that the giant crabs were an old monster. The reason for this is that very little footage of them exists, just the odd couple of scenes. There isn't a single complete episode of this serial, which is a real shame as it is one of the earliest Patrick Troughton adventures. Nothing from his first season as the Doctor survives in its entirety. In this story, his character really starts to consolidate and we begin to see aspects that would continue through the next two seasons. So far the writers hadn't been sticking to a particular set of character traits so that this newly-regenerated (not that it was called that then) Doctor could develop in his own way. One scene to look out for should this one be rediscovered is the Doctor awarding himself '10/10' after solving a problem, fun Troughton at his best.