Over the years "Doctor Who" has had a variety of comics, published in different formats by different companies, and covering pretty much all the Doctors (Even Cushing). Although often fun and entertaining, they sort of exist often in their own seperate continuity away from the TV show and even the novels and audio lines. Although it's worth noting that elements from the comic series, such as Frobisher (in the audios and novels) and the design of the Dalek Emperor (In Rememberance of the Daleks), have crossed over. RTD has also mentioned certain elements of the comics in his write-ups of the series (And I believe RTD has written a few DW comics).
A run-through of Doctor Who's comic history can be found here:
http://www.comicbookdb.com/character.php?ID=1259
A run-through of Doctor Who's comic history can be found here:
http://www.comicbookdb.com/character.php?ID=1259
