Justice League: 10 Insane Fan Theories You Need To See

Unlike Marvel, DC chose to keep their movie and television universes separate, a decision that's allowed each section to flex its muscles without being creatively handcuffed by the other.

But is all that about to change? Dozens of fans on Reddit (and other places around the web) have been commenting for some time that Justice League will see these two universes collide, bringing heroes like Green Arrow and The Flash into contact with the likes of Batman and... The Flash.

Indeed, one of the biggest holes in this theory is that the movies already feature a version of The Flash, played by Ezra Miller, but this issue is sidestepped by incorporating the multiverse and alternate Earths - so there can be two versions of The Flash, in different universes, that then join together.

This could take the form of a Crisis On Infinite Earths-style crossover event. In that comic arc, alternate versions of characters collide in order to take down the Anti-Monitor. Obviously the latter villain isn't in Justice League (that we know of) but another villain could be used in his place.

Interestingly enough, most DC Comics crossover events - including Crisis On Infinite Earths - feature red skies. This has become such a common occurrence that whenever DC fans see red skies, they automatically think multiverse, crossovers and worlds colliding.

So it's hard not to think the same when you see shots like this.

Is it unlikely? Yes. DC has already been criticized for shoving too many characters into its movies, and they haven't yet earned an Avengers: Infinity War-style crossover event. Justice League should focus on the core members of the team and build a great movie around those few - which is what we think it will do.