11 Things Justice League Must Avoid

8. A CGI Overkill Villain

Looking back at the history of comic book movies, don't practical, human actors usually make for far more compelling villains than CGI mo-cap messes? The Joker, Loki, Baron Zemo, Doc Ock (who brilliantly blended practical and digital) and Magneto are just a few of the genre's best baddies, while there are far more examples of terrible digital villains who flopped hard (such as Doomsday, Venom, Incubus and The Lizard).

When done badly, a fully CGI antagonist lacks character and screen presence, too overly stinking of artificial creation which, even in the insane world of superhero movies, usually struggles to match the appeal of an actual, physical actor.

It's already known that Ciarán Hinds will be playing Steppenwolf via performance capture, and the obvious hope is that he'll end up more akin to, say, Caesar from the Planet of the Apes reboot franchise than an anonymous, blurry, unrecognisable computer creation, but this is one major red flag where the film is most at risk.

At least, unlike Doomsday, Hinds has an actual, acclaimed actor attached, so he'll get to, you know, emote and stuff.