As part of a series Comics Forum are running on Alan Moore’s shorter works, here’s an essay by me about his Doctor Who work.
http://comicsforum.org/2012/09/05/doctor-who-and-the-genesis-of-alan-moore-by-lance-parkin/
Copyright concerns meant that Comics Forum didn’t include a couple of illustrations. Here’s the fourth Doctor cameo I mention. Doctor Who’s the BBC’s, the script is Alan Moore’s, the art is David Lloyd’s, it was published by Marvel UK, fair use blah blah no infringement intended yadda yadda: