So last year I watched Batman: The Animated Series, Batman '89 and Batman Returns. A friend lent me a copy of Arkham Asylum: A Serious House on Serious Earth. I thought all of those were great.
I recently watched the Harley Quinn animated series. The same friend lent me a copy of Superman For All Seasons, Dark Night: A True Batman Story, and Batman: Hush. Then I bought these through a combo of my local hobby shop and Target's buy 2 get 1 free sale.
