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So sayeth the great Lord of Darkness Sauron, or he will send Darth Vader to terminate you.

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Old jokes? They're classics! You of all people should understand brand management.
~ The Joker to Batman

Joker is the secondary antagonist in Justice League Action. He is Gotham's most notorious criminal mastermind and Batman's archenemy.

He was voiced by Mark Hamill who has also voiced multiple incarnations of the Joker over the years.


Once a small-time crook, the Joker fell into a vat of chemicals that turned his skin white, hair green and his lips red like a crazed clown.

After becoming the Joker, he causes mayhem at Gotham City as Batman's foe. He often tries to gas Gotham or defeat Batman. Once he's captured by Mongul who forces Joker to make his warriors laugh. When Joker does so by shocking Mongul, Mongul tries to throw Joker into space but Superman saves Joker.



  • The casting of Mark Hamill as this incarnation of the Joker surprised many Batman fans, as he had previously stated that his portrayal of the Joker in Batman: The Killing Joke would be his last Joker performance. However, Hamill is known to have changed his mind previously, as he once stated that his final Joker performance would be that of the Arkhamverse incarnation in Batman: Arkham City before reprising the role in Batman: Arkham Knight. Thus, we can assume that this will not be Hamill's last time as the Joker.

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