Warning: Spoilers for Batman '89: Echoes #5!Jack Nicholson's Joker might be jealous of Harley Quinn's new digs. Harley Quinn has become one of the latest additions to the Burtonverse, as the ...

In the preview for Batman '89: Echoes #5 – written by Sam Hamm, with art by ... the real Harley Quinn, and her descent into madness is happening rapidly. Originally introduced as Joker's ...

Phoenix reprises his role in the sequel, which explores the twisted relationship between Joker and Harley as they meet at Arkham Asylum, the notorious psychiatric hospital for the criminally insane.