Batman: I didn't have to go easy on you. A different binding agent, a stronger mix... I want you to remember that. I wanted to remind you to stay out of my way. In all the years to come, in your most private moments, I want you to remember the one man who beat you.
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Batman: The Dark Knight Returns, Part 2 (2013)
Ending / spoiler
Directed by: Jay Oliva
Starring: Peter Weller, Ariel Winter, David Selby, Michael Emerson
Batman defeats Superman with the help of a high tech suit and Green Arrow using an arrow with synthetic kryptonite. Alfred dies of a stroke after destroying Wayne Manor, the Batcave and everything else that could expose Batman's secrets and methods. At Bruce Wayne's grave, Clark Kent/Superman hears Bruce's heartbeat and realizes that he faked his death. Batman decides to share his methods and secrets with the reformed Mutant gang and the Sons of Batman group; his "army" will operate in secret in order to continue to help Gotham City.
Racer X
Trivia: While Superman is fighting Batman inside a building, a poster of Christopher Reeve as Superman can be seen on the wall.
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Answer: Typically, the Joker is immune to the toxin. It depends on the writer, and in this story, that would seem to be the case.
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