Oh, Doctor

Was that intriguing little thing with Sarah Jane Smith's mouth a stage direction or was that ad-libbed? I've been watching all the episodes of the Tom Baker years of Doctor Who and there were a few scenes featuring actress Elisabeth Sladen in this installment that caught my attention as they seemed a bit out of place. As a long time fan of what was basically a children's show with mature science fiction themes I never really looked at any of the characters in anything more than a superficial manner.

That has now changed.