Hellboy and Abe Sapien are far from the weirdest characters created by Mike Mignola. That honor may rest with a Civil War-era hero named The Amazing Screw-On Head. And with that comic being reprinted in a new 20th anniversary collection, fans are being treated to a lost story from Mignola's archives.

IGN can exclusively reveal a preview of that story, dubbed "Axxor, Slayer of Demons." Check it out in the slideshow gallery below:

For those unfamiliar, The Amazing Screw-On Head was a one-shot comic released through Dark Horse in 2002. The story revolves around a sentient robot who works as a secret agent for the Lincoln Administration. Inspired by classic action figure lines of the '80s and '90s, The Amazing Screw-On Head can attach his head to different bodies, each with powerful abilities of its own.

While the original comic remains, to date, the only to feature the character, it was later adapted as an animated pilot episode in 2006, written and executive produced by Hannibal's Bryan Fuller.

To celebrate the 20th anniversary of the comic, Dark Horse is releasing a new hardcover collection called The Amazing Screw-On Head and Other Curious Objects. That book will include roughly 40 pages of new material, including the Axxor story. The book will be released in comic shops on July 20 and bookstores on July 26.

Dark Horse is also marking this anniversary with a new Amazing Screw-On Head fine art print. Featuring a new image from Mignola and colorist Dave Stewart, this print is being sold exclusively through Dark Horse Direct.

The print measures 18" x 24" and is priced at $49.99. It's limited to 300 units worldwide. You can preorder an Amazing Screw-On Head print now.

Both of these releases are being timed to the upcoming first public screening of the documentary film Mike Mignola: Drawing Monsters. The premiere event is being held at Los Angeles' Million Dollar Theatre on Saturday, August 13. Tickets are available for purchase now.

That documentary will offer Mignola fans another glimpse of a lost project, as it turns out Mignola worked on a Thor animated series based on traditional Norse mythology.

Jesse is a mild-mannered staff writer for IGN. Allow him to lend a machete to your intellectual thicket by following @jschedeen on Twitter.