In 1999’s Batman: Harley Quinn #1, by Paul Dini and Yvel ... Filled with enough thematic clown decor to make the place undeniably Joker’s, this Sanctum was mainly utilized during No Man ...

Harleen Quinzel, aka Harley Quinn, was one of the few Batman villains to debut outside the comics. Her first appearance was in the 1992 Batman: The Animated Series episode “Joker’s Favor.” ...