Parents need to know that Justice League Dark is an R-rated, feature-length animated movie based upon Justice League Dark comics, which first appeared in 2011. The original stories united a team of heroes (i.e., John Constantine, Deadman, Zatanna) who'd been introduced in DC comics over the years and who were steeped in supernatural forces and magic. The team fought battles against powerful enemies who practiced dark arts and had also surfaced in previous DC tales. The movie adds Batman to the mix, with brief appearances by Superman and Wonder Woman, to launch a more violent Justice League animated franchise directed at older fans to whom sinister villains like Destiny, Felix Faust, and Alec Holland would appeal. But with very little guiding backstory or other information, viewers are plunged into a gory, violent world of blood, explosions, people consumed by fire, and black magic. So, in addition to the almost continuous mayhem (citizens terrorized, deaths, raging battles), it's hard to keep the characters straight. There are more than a dozen evil-doers and just as many would-be good guys. Occasional swearing includes "s--t," "ass," "bastards," and "hell." Bottom line? It's too violent and spooky for kids, and too confusing and dense for those unfamiliar with these "denizens of the Dark."