Detective Comics #31
Detective Comics #31 (cover date September 1939, on sale July 30, 1939) represents a defining turning point in Batman's earliest career: it is the first time the character faced a costumed, super-powered adversary — the Monk — pushing the strip away from straight crime pulp and into Gothic horror territory that would echo through the mythology for decades. The issue simultaneously introduced three pieces of the enduring Batman toolkit that are now inseparable from the character: Julie Madison (Bruce Wayne's first romantic interest), the Batarang, and the Batgyro (the direct ancestor of every Batplane and Batwing to follow). Gardner Fox's script sent Batman on a genuinely globe-spanning chase — from New York to Paris to Hungary — expanding the character's scope far beyond the urban-crime stories of the first handful of issues. The Bob Kane cover, inked by Sheldon Moldoff, became one of the most homaged images in comics history, repeatedly referenced by artists from the Silver Age through Neal Adams and beyond.
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Bill Finger had written Batman's first two appearances, but his chronic difficulty meeting deadlines led editor Vin Sullivan to bring in Gardner Fox, who scripted a six-issue run beginning with Detective Comics #29; issue #31 falls squarely in that stretch. The Batman story is credited in contemporary accounts to Gardner Fox with a co-credit to Bill Finger on the first chapter, with art by Bob Kane and inking by Sheldon Moldoff — the same Moldoff who would ghost-pencil Kane's work extensively in later years. Fox, a prolific pulp reader steeped in Gothic literature, drew the Monk's name and vampire-and-werewolf nature from sources including the 1796 gothic novel The Monk by Matthew Lewis, synthesising those horror archetypes into what became the template for the colorful Batman supervillain. The issue's anthology format also featured backup strips by Jerry Siegel and Joe Shuster (Slam Bradley) alongside Speed Saunders, Buck Marshall, Cosmo, Larry Steele, Bart Regan, and Bruce Nelson, all overseen by Sullivan.
Trivia · 8 facts
- Cover date: September 1939; actual on-sale date: July 30, 1939. Published by Detective Comics, Inc. (the pre-merger imprint later folded into DC Comics). Editor: Vin Sullivan.
- First appearance of The Monk (called 'the Master Monk' in-story), Batman's first costumed, masked, and super-powered villain — a hypnotist with vampiric and werewolf characteristics who wears a distinctive red cloak and hood.
- First appearance of Julie Madison, Bruce Wayne's fiancée and Batman's first significant romantic interest; created by Gardner Fox, Bob Kane, and Sheldon Moldoff. She appears sporadically in Golden Age issues until breaking off her engagement in Detective Comics #49 (1941) and later made her live-action film debut, played by Elle MacPherson, in Batman & Robin (1997).
- First appearance of the Batarang (spelled 'Baterang' in the original story), described as modeled after an Australian Aboriginal boomerang — the founding gadget of the entire 'Bat-arsenal' concept.
- First appearance of the Batgyro (also called Batplane in-story), a bat-themed autogyro stored in a secret hangar — the first Bat-vehicle of any kind and the direct ancestor of every subsequent Batplane and Batwing.
- Constitutes Batman's fifth overall appearance in comics; the story also marks the first explicit naming of Batman's operating city as New York (later retconned as Gotham City beginning in Batman #4).
- The Batman story is Part 1 of a two-part arc; the conclusion — including Batman killing the Monk and his companion Dala with silver bullets — was published in Detective Comics #32 (October 1939). The arc inspired Grant Morrison and Klaus Janson's Batman: Gothic (1990), was retold by Matt Wagner in the six-issue Batman and the Mad Monk (2006–07), and the Monk was revived by Gerry Conway in Detective Comics #515 (1982).
- The Batman story has been reprinted in at least a dozen collections, including 100-Page Super Spectacular #DC-14 (1973), The Greatest Batman Stories Ever Told (1988), Batman Archives Vol. 1 (1990), The Batman Chronicles Vol. 1 (2005), Batman: The Golden Age Omnibus Vol. 1 (2016), and a full facsimile edition released by DC in May 2025.
Cast · 13 characters
Full credits
Full plot ⚠ may contain spoilers
▸ Reveal full plot — may contain spoilers
When Batman discovers Julie in a trance, he is advised by a doctor to take her to Hungary, where he faces a living vampire, who wishes to kill the Caped Crusader and feed Julie to his werewolves.
Plot details indexed by the Grand Comics Database (CC BY-SA).