* DevelopmentHell: Quite a few stories got stuck in it or were vetoed altogether. One story would have seen the Eighth Doctor versus sentient paintings; another featured an earlier version of Izzy's character as a pair of twins TouchedByVorlons. The authors' notes really elaborate on the writing process, with plenty of first draft scans and hand-written notes. Alan Barnes ended up recycling his vetoed ideas for the Eighth Doctor in Charley Pollard's [[AudioPlay/BigFinishDoctorWho Big Finish]] story arc instead (notably in "Storm Warning" and "Neverland").
* WhatCouldHaveBeen: One potential comic would have been a multi-Doctor story, with Tenth meeting Eighth and Destrii.
** Creator/RussellTDavies offered the actual Eight-Nine regeneration to the strip, but a variety of restrictions on the matter (not being able to feature the Ninth Doctor with anyone bar Rose, for example, and more importantly the whole Time War thing) led to the idea being ultimately dropped by the editorial staff, who felt they wouldn't be able to do it justice. A draft script and a drawing are available in the Eighth Doctor compilation ''The Flood''.
*** They note in the commentary for Ninth Doctor compilation ''The Cruel Sea'' that they would've been de-canonised by "The Night of the Doctor" and the whole War Doctor thing.
** The commentary for Seventh Doctor compilation ''The Good Soldier'' reveals the following might-have-beens:
*** A 1989 proposal for a Seventh Doctor and Ace UK newspaper strip which didn't get commissioned due to perceived declining interest in the series and uncertainty over its future.
*** A ten-part Abslom Daak project by Daak's creator Steve Moore, nixed by changes at Marvel US.
*** A miniseries teaming up the Seventh Doctor and ComicBook/DoctorStrange by Andrew Cartmel, not commissioned due to lack of enthusiasm for ''Doctor Who'', which Marvel US saw as a cancelled series.
*** Mike Collins as artist on "Evening's Empire", which fell through because Mike got a monthly series with DC, ''Peter Cannon: Thunderbolt'', and had to start writing immediately.