An Unearthly Child, always fun to go back to this Susan was so much more interesting in the pilot.
She had a strange fey quality mixed with her strong scientific knowledge that quickly gave way to hysterics in later episodes.
Just watching the comedy sketches on the extras I'd forgotten all about them.
I watched Planet of the Giants earlier this week, first time I had seen it, interesting pacing with parts 3 & 4 cut together. It only runs a bit longer than a new Who episode and would work pretty well as a story for a modern Doctor, I could imagine 11 and the Ponds in this story.