"Zombie King" is the Seventh episode of the first season of Justice League Action. It is the overall seventh episode of the series.
Batman teams up with John Constantine, Zatanna, and Swamp Thing when Solomon Grundy tries to raise a zombie army with a magical gem that would also enable him to transform anyone into zombies.
- Batman says that he got the freezing weapons from one of his enemies, most likely referring to Mr. Freeze.
- John Constantine, Zatanna, and Swamp Thing appear in this episode and are also known from the team called "Justice League Dark" in DC comics.
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