"When Russell pushed the script across the table I instinctively did what everyone in my profession does: I checked how many lines I’d have. How else do you know if you’re an important character or not? I thought I’d be rifling through for my own appearance but I couldn’t believe it: there I was virtually on every page! This wasn’t a cameo - this was a whole story….. Twenty-nine years after walking away, I was going back to Doctor Who.” - Elisabeth Sladen