Detective Comics #40
Detective Comics #40 (June 1940) introduced Basil Karlo — the original Clayface — to the DC Universe, making it the founding chapter of one of Batman's most enduring villain legacies, a name that would eventually be carried by eight distinct characters across eight decades. Written by Bill Finger and drawn by Bob Kane, the story structured Clayface as a horror-film-inflected murder mystery, demonstrating that Batman's rogues gallery could draw from classic cinema and pulp thriller tradition rather than pure superhero fantasy. The issue also carries the distinction of featuring the first cover appearance of the Joker in the Detective Comics series, giving it a double dose of Golden Age significance. Karlo's grounded, mask-wearing origins — far removed from the shape-shifting versions that followed — prove how radically a character concept can evolve while the original remains the foundation.
In "The Murders of Clayface," Bruce Wayne and Dick Grayson visit a movie studio after learning that Julie has become a film star, only to find themselves caught in a web of suspense when a series of ominous events unfold. With the help of his young partner, Batman must unravel the mystery behind a killer who melts and reshapes at will—before another victim falls. Written by Bill Finger and illustrated by Bob Kane with inks by Jerry Robinson, this 1940 classic features a chilling case that tests the Dark Knight’s instincts, with a cover by Bob Kane and Jerry Robinson.
When Bruce and Dick visit the studio to see Julie, their reunion takes a dark turn as a string of mysterious events sets off Batman’s instincts. With a killer known as Clayface on the loose, the Dark Knight must protect Julie and unravel a threat that’s as dangerous as it is elusive.
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The Batman lead story, titled 'The Murders of Clayface,' was written by Bill Finger and illustrated by Bob Kane with inking and lettering by Jerry Robinson, under the editorial oversight of Whitney Ellsworth. The issue was published with a cover date of June 1940 and went on sale May 3, 1940, just two issues after Batman's solo title launched. Bob Kane later stated that the character's appearance was partly inspired by Lon Chaney's 1925 performance in The Phantom of the Opera, and that the name 'Basil Karlo' was a deliberate mashup of horror-screen legends Boris Karloff and Basil Rathbone. The issue was a 68-page anthology package featuring backup strips headlined by Jerry Siegel, Gardner F. Fox, Jack Lehti, Chad Grothkopf, and others, with Whitney Ellsworth editing the entire book.
Trivia · 8 facts
- First appearance and origin of Clayface (Basil Karlo), created by writer Bill Finger and artist Bob Kane.
- The lead story is titled 'The Murders of Clayface' (also referred to as 'Beware of Clayface'); Karlo is portrayed as an embittered former horror-film actor who dons a monster mask and kills the cast of a remake of his classic film 'Dread Castle' in order, mirroring the deaths in the original movie.
- Bob Kane stated Karlo's name was derived from real-life horror actors Boris Karloff and Basil Rathbone, and the character's look was partly inspired by Lon Chaney's 1925 Phantom of the Opera portrayal.
- The original Clayface had no shapeshifting powers — he was a purely human serial killer using a costume and mask; the supernatural clay-morphing abilities associated with the name were introduced by later successors beginning with Matt Hagen in Detective Comics #298.
- The cover of the issue marks the first appearance of the Joker on a Detective Comics cover — some comics historians have argued the cover figure was originally drawn for a different Joker story and repurposed.
- The issue is an anthology of nine stories, also featuring The Crimson Avenger (with Wing How), Speed Saunders, Slam Bradley (as 'Sam Bradley'), Bart Regan, Steve Malone, Red Logan, and Cliff Crosby strips; editor Whitney Ellsworth oversaw the entire package.
- The Batman story was retold in updated form in Secret Origins (Vol. 2) #44 (September 1989), tying Karlo into post-Crisis/New Earth continuity as a lead-in to the 'Mud Pack' storyline in Detective Comics #604–607.
- The issue has been reprinted at least seven times, including Batman Archives #1 (1990), The Batman Chronicles #2 (2006), Batman: The Golden Age Omnibus #1 (2016), Batman Arkham: Clayface (2017), and a DC Facsimile Edition published October 1, 2025.
Cast · 14 characters
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Reprints
↩ Reprints Batman #1 (1940)
Reprinted in Batman #1 (1940), Batman from the 30s to the 70s #[nn] (1972), Batman Archives #1 (1990), DC Archiv Edition #3 (1999), The Batman Chronicles #2 (2006), Batman: The Golden Age Omnibus #1 (2016), Batman: The Golden Age #1 (2016), Batman Arkham: Clayface #[nn] (2017), Detective Comics 40 (Facsimile Edition) #[nn] (2025)
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