'Boo & Hiss' has been a passion project of mine for a couple of years. I was intrigued with the idea of what would happen in a classic cartoon predator/prey relationship if the predator - in this case, a cat - got to finally do in his adversary only to have the mouse return as a ghost and bedevil the cat.

There's something very, very liberating about Harley Quinn. Much more so than a character like Catwoman or Poison Ivy. Those are great characters. But then again, those characters are more of the femme fatale and the temptress roles.

I really didn't have any plan for her other than the henchgirl role, who was better at getting laughs out of the other gang members than the Joker was. I gave her the name Harley Quinn because I thought Harley was a fun name for a girl, and a lot of 'Batman' character names have a bit of a pun to them, like E Nygma.

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