I can remember 40 years ago reading DC comics that would "step outside" the regular series to explore "what if" plot ideas: what if humans advanced in 100 years to be almost as powerful as Superman, or what if the Legion of Superheroes were caught in a planetary concentration camp, or what if Superman lost his powers and became a superhero similar to Batman using Kryptonian technology (and similar plots).
This movie is based on a graphic novel using a "what if" type of idea: it's the same characters as in the Justice League comic book series (and other series characters), but with variations as necessary to develop the plot.
As long as you don't expect the usual and familiar, this movie takes the characters in interesting new directions with more adult themes.
By the way, since this is more adult you may not want very young children to view this (or at least watch it without them first before you decide to let them see it). The beginning of the movie in particular may not be suitable.
This movie is based on a graphic novel using a "what if" type of idea: it's the same characters as in the Justice League comic book series (and other series characters), but with variations as necessary to develop the plot.
As long as you don't expect the usual and familiar, this movie takes the characters in interesting new directions with more adult themes.
By the way, since this is more adult you may not want very young children to view this (or at least watch it without them first before you decide to let them see it). The beginning of the movie in particular may not be suitable.