Black Mass appears in 38 issues.
The Power Company
Joker: Last Laugh
Justice League of America
Justice League America
Justice League United
Crisis on Infinite Earths
JLA Secret Files and Origins
The DC Comics Encyclopedia
Batman: The Joker's Last Laugh
Green Lantern: Revenge of the Green Lanterns
Joker: Last Laugh Secret Files
Justice League of America: Sanctuary
Green Lantern Sonderband
Justice League: Forever Heroes
Justice League United Annual
Batman vs. Superman: The Greatest Battles
Justice League United: The Infinitus Saga
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