There's a really good Batman : TAS where they get captured and they put him on trial.
The villains created Batman, not vice versa.
What was the name of this great episode?
It is obvious the idea of who is guilty is a huge theme in all of Batman's stories and I remember seeing this episode and being intrigued with it when I was younger but at the same time being frustrated that Batman's only response was just "No! you created me!"
The episode didn't take it to the level that The Dark Knight or the Long Halloween and Dark Victory took it to. I say this because the villians were right to an extent, but then so was batman. Tim Burton says it best with you created me and I created you.
Ledger saying "you complete me" has meaning behind it. Escalation is a lot like evolution. Batman was created because the good need something better to fight the mob. Supervillians were created in response to Batman's extremely aggressive behavior outside of the law.
"I think were are destined to do this forever" is a beautiful line. It is more a statement on the fight between good and evil. The Joker knows its human nature to break rules and laws, so there is truly no perfect institution, and Batman knows that people need rules to survive(It's Batman's rule that saved the Joker's life). They are stuck in this fight, neither can surrender and neither can be truly victorious.
I am reminded of a great line in Pirates Of the Carribean spoken by Captain Barbossa.
"So what now Jack Sparrow? Are we two immortals locked in epic battle till the Judgement day when the trumpets sound?"
"Or you could surrender" says Jack Sparrow but of course he can't, so why would Barbossa?
Kinda makes me happy and sad that Batman and the Joker will always exist in one form or another.