I don't follow any of the animated Batman series, or other animated Batman films, or the Batman comics, but I enjoyed it for what it was. I will say is just seemed way too dark for animated. The lead Owl guy was good, but generic. The kid who played Robin did a good job as young Robin. That is why I didn't enjoy it as much. I think it was darker than the live action Batman films, minus The Dark Knight of course.
The guy who plays Nightwing Original Robin gone independent was good. I honestly though the voice for Batman was the weakest of the bunch. It stayed on track too, which I appreciate. . Robin, which I am assuming follows the comic series, follows Damian Wayne, one of the latter Robins, who struggles with the moral issue of killing, which Batman enforces against, and outside influence from a dangerous secret society The Court of Owls.
I honestly wouldn't pay to see it because of the overall darker tone though. I also liked that they had one of each type of Batman villain, a complete psycho and an organization trying to take order through chaos. . . .
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