Barrowman is adapting a story from the newest edition of the magazine, "The 49th Key," by¬†Erika Lewis.
Heavy Metal's¬†Jeff Krelitz¬†and¬†David Boxenbaum¬†will also executive produce, with former Dark Horse Comics PR director¬†Jeremy Atkins onboard as associate producer.
THR describes the story as follows:
The 49th Key is¬†based on the 16th century legend of Enochian magic, which tells of a secret language of angels.
The first chapter in an expansive fantasy series tells of a rogue archeologist and a young autistic and mute boy on a treacherous journey through England to bring the boy home. The boy turns out to be the key to a gateway between our world and that of Enochia, a magical society that exists below the Earth's surface, filled with fantasy creatures and highly advanced humans.
"The 49th Key" debuts in Heavy Metal Magazine #273, which is out Wednesday with art by J.K. Woodard.