It was notable for briefly reintroducing Roger Delgado's incarnation of the Master to the "present day" of Doctor Who and featuring the beginnings of his regeneration at the end of the story, presumably (though not explicitly) into the incarnation played on television by Peter Pratt and later by Geoffrey Beevers. This "plugging" of a hole in the Master's timeline notably conflicted with the version of the Delgado Master's demise featured in the earlier novel Legacy of the Daleks.
Less flashily but equally importantly, Doorway to Hell made another addition to fundamental Doctor Who lore in confirming, from the mouth of a Time Lord, that TARDISes' ability to repair themselves with a new appearance following great trauma (as featured in the TV stories The Eleventh Hour and, later, The Ghost Monument) was in fact a form of regeneration in its own right.
to be added
- Twelfth Doctor
- Gabriel Gayle
- Jess Collins
- Jack Hayes
- Katya Dabrowski
- Devina Collins
- Maxwell Collins
- Lloyd Collins
- The Master
- Doorway to Hell is set after the Doctor and the Master's "affair with the Daleks and Draconians", referring to Frontier in Space, the last appearance of Roger Delgado as the Master prior to his death.
- The appearance of the Master's regeneration resembles the effect used on television since The Parting of the Ways in 2005. The shot of the Master looking at his hand, meanwhile, is closest to a shot from The Time of the Doctor.
Original print details
- (Publication with page count and closing captions)
- DWM 508 (12 pages) Next: Falling to Hell
- DWM 509 (12 pages) Next: Master Plan
- DWM 510 (12 pages) Next: Death in Hell
- DWM 511 (12 pages) The End
- The Master is aware of the unfortunate events the Collins were involved since meeting the Doctor: Lloyd's body was changed by an alien bacteria, while Devina had to watch him nearly die, (COMIC: The Pestilent Heart) and Max was abducted by Skadi and Broteas, while Jess was hunted down. (COMIC: Bloodsport)
- Through his TARDIS' scanner, the Master watched the Doctor's TARDIS explode over Brixton. (COMIC: The Pestilent Heart)
- The Doctor is from far in the Master's future, and says his age is four billion. Ohila had previously mentioned the Doctor had spent four and a half billion years inside the confession dial. (TV: Hell Bent)