"Shazam Slam" is the first episode of the first season of Justice League Action. It is the four part one-hour series premiere.
The villainous Black Adam battles Batman on the Rock of Eternity and unleashes a horde of Djinn determined to turn the Earth back to its pre-human, volcanic state. Affected by the otherworldly powers of these primordial monsters, Batman becomes possessed and is turned into a giant flying Batmonster laying waste to the Hall of Justice, with only Superman capable of taking the fight to the Dark Knight. One by one, the Justice League - with the help of Shazam and The Wizard - must hunt down and defeat each Djinn in order to yet again save the world from destruction.