Doorway to Hell was a comic story published in 2017.
to be added
- Twelfth Doctor
- Gabriel Gayle
- Jess Collins
- Jack Hayes
- Katya Dabrowski
- Devina Collins
- Maxwell Collins
- Lloyd Collins
- The Master
- The Master uses the alias of "Professor Dominar".
- 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 Master is aware of the unfortunate events the Collins were involved since meeting the Doctor:
- 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)
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