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Character
Harley Quinn first appeared in The Batman Adventures #12, cover-dated September 1993, from DC Comics, created by Paul Dini and Bruce Timm. She first appeared on television in the Batman: The Animated Series episode 'Joker's Favor' (September 1992) before her comic debut.
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First appearance, key issues and what drives the prices.
Key issues
Harley Quinn's first comic is The Batman Adventures #12, cover-dated September 1993 from DC Comics. It was printed in large numbers, so its price depends mostly on grade: 9.8 copies, newsstand copies and the scarcer second printing carry the premium.
Updated Oct 11, 2026
Key issues
Most famous Batman quotes come from films, TV and animation rather than the original comics, and no quote makes a comic more valuable. What collectors pay for is a key issue, such as Detective Comics #27, in a high certified grade.
Updated Oct 11, 2026
Characters
Harley Quinn's first comic-book appearance is The Batman Adventures #12, cover-dated September 1993, by Kelley Puckett, Mike Parobeck and Rick Burchett, in the tie-in series to Batman: The Animated Series. She was created by Paul Dini and Bruce Timm for the television episode “Joker's Favor”, first broadcast in September 1992, a year before she reached print.
Updated Oct 11, 2026
Key issues
The Batman Adventures #12 (September 1993) is Harley Quinn's first appearance in comics, a year after her television debut in Batman: The Animated Series. It is the most valuable comic of the 1990s after New Mutants #98 and a standard Modern Age key. Because it was printed in large numbers, the value sits almost entirely in 9.8 copies, newsstand copies and the scarcer second printing.
Updated Oct 11, 2026