The Joker (Alan Tudyk) is the main antagonist in DC Universe's animated series Harley Quinn, which now streams on HBO Max. Of course he rules Gotham as the clown prince of crime and rival to none other than Batman. At the start, his girlfriend is Harley Quinn. Although Harley realizes his obsession with Batman overshadows their romantic relationship. She dumps the Joker so she can stop relying on him and prove herself as a villain. When she joins the Legion of Doom, the exes turn to rivals. The Joker becomes a major character in season two when his evil plans come to fruition.

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