Post-Cavendish stories are usually very continuity heavy, and require the reader to be relatively familiar with Hellboy's history.
In addition to the comics, the Hellboy novels written by author Christopher Golden are also considered in-continuity.
[6] It started with an untitled three-page promotional piece before launching into the three-issue miniseries Hollow Earth.
Guy Davis was the primary artist on the series and John Arcudi joined Mike Mignola as co-writer with the miniseries The Dead in 2004.
: Hell on Earth is the third and final story cycle of B.P.R.D.. Scott Allie is the lead writer with Mike Mignola.
The cycle was originally planned to go for longer, on into the 1950s,[7] but it was cut short because Mike Mignola felt he had too many books going on.
[8] Joshua Dysart was the lead writer for this series, although the final miniseries was written by John Arcudi to connect with what he was doing in B.P.R.D.
The cycle is written and drawn by twins Gabriel Bá and Fábio Moon with Mike Mignola.
John Arcudi became the lead writer with Mike Mignola from 2012's The Burning Hand onward with the stories continuing mostly chronologically from there.
[10] Most of the issues in the ongoing run of the series were collected in omnibuses as the story cycle Dark and Terrible.
This Hellboy spinoff primarily features stories about Sir Edward Grey, an agent of Queen Victoria and paranormal investigator, although on one occasion it included The Burial of Katharine Baker, which is about another witchfinder, Henry Hood.
[11] In 2020 a second miniseries, Frankenstein Undone, was announced[12] and later canceled after issue #2 due to Mignola's refusal to continue working with writer Scott Allie.
[14] In October 2016, The Visitor: How & Why He Stayed was announced, a five-issue miniseries about the alien Hellboy met in Conqueror Worm.
[18] On the final page of 2021's Sir Edward Grey: Acheron, a new miniseries, Koshchei the Deathless in Hell was announced.
[21] Crimson Lotus marks the first time a Hellboy Universe series has borne the name of a female character.
In February 2021, Dark Horse announced The House of Lost Horizons: A Sarah Jewell Mystery.
: The Devil You Know, following the history of Agent Howards' mysterious sword, beginning with his prehistoric counterpart, Gall Dennar.
Bloody Disgusting announced The British Paranormal Society: Time Out of Mind in January 2022, a miniseries that would focus on the characters Simon Bruttenholm (uncle of Trevor Bruttenholm) and Honora Grant from Sir Edward Grey: Witchfinder.
Mike Mignola has also mentioned that the short story The Magician and the Snake is not canon, but rather a fairy tale in the Hellboy Universe.
[28] Guillermo del Toro originally directed two live action films, 2004's Hellboy and its 2008 sequel.