This was a birthday present I made for my friend's 40th in 2005.
We have a long-running in-joke about the phrase "What are you doing here?" cropping up everywhere in TV shows. As we also both like Doctor Who, doing this seemed like a good idea.
The original (which went to the end of Eccleston) took seven months to make - Six to watch all the episodes and one to edit it together. I've since updated it to the end of the 2008 series.