Yours is an older post, and it'd be great to imagine if it was the same guy, but its not Doc Brown that she's married to but Christopher Lloyd the producer.

I just watched the ep where Harley hooks up w/ Poison Ivy.
It was awesome where the teen boys started talking rudely & Harley whips out a bazooka & "OK you pigs HERE COMES THE PADDLE!".
I did not know anything about the Arleen & I see is married to Christopher Loyd. Is that why she is so good at being the Jokers g/f??
When I saw they were married first thing I thought of was the evil Judge Doom from Rodger Rabbit.
Just kiddin, she really is one of the best characters in the show.