Justice League vs. Teen Titans

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The Justice League battle the Legion of Doom which consists of Lex Luthor, Solomon Grundy, Cheetah, Weather Wizard, and Toymaster. After the Legion is defeated and captured, Weather Wizard runs away, but is possessed by a shadow-like creature, revealed to be the demon Trigon, whose supernatural nature allows him to harm Superman. Robin disobeys his father's orders to get civilians to safety, thinking he can help the Justice League fight Trigon, and ends up botching their mission by allowing Trigon to escape. In order for his son to learn teamwork, Batman sends Robin to join the Teen Titans. Trigon possesses Superman, whose odd behavior worries Wonder Woman.