I was always clear that Saturday, 23rd November 2013 would have to involve some Doctor Who as well as the non-Who viewing I'd planned in October 2013 - you can see more of that in a few clicks' time.

One week before, ostensibly as preparation for attending the Invasion Earth Colin Baker event, I watched "The Twin Dilemma".

It then occurred to me that I just about had enough time to do a reverse-order Doctor countdown. I'm always trying to find new ways to cut the Doctor Who cards, so I instantly ruled out debut stories which was far too obvious and which I'd done too many times before.

This is what I came up with - one a day from Saturday 15th November to Thursday 21st November, a break on Friday, and then the main viewing on Saturday 23rd.

Can you guess the connection between these six?

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