I absolutely loved this. It was dark, brooding, and surprisingly grown-up (bad guys were shown smoking and using actual guns, rather than the laser-blasters found in other cartoons).
And Mark Hamill's Joker IS the definitive Joker - and the relationship between that Joker and Harley Quinn was brilliant. Harley was a great character in and of herself, but when she was paired up with "Mistah J" or Poison Ivy, she shone.
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Why so serious?