What Doctor Who Taught Me About Life, the Universe and Everything

I don't often do comics about Doctor Who because I'm still in the middle of watching it and I'm worried I'll get something wrong, but I think this is a concept that seems to hold true throughout the series. Plus I consulted some Whovians for advice!

As a latecomer to the series, I've just started on the Tennant run of the new Who and am so far enjoying it quite a bit. Who's your favourite Doctor?