Anyone who hasn't been living under a rock on Apokolips for the last year or so will know that Justice League is coming and will be familiar with its basic premise.
You know the drill: Batman is attempting to round up the greatest heroes who aren't under the ownership of Marvel Comics to tackle an alien threat that can only be defeated through their collective might.
The previous films in the DC Extended Universe canon indicate that Wonder Woman is already on board, while the Justice League trailers make it beyond obvious that The Flash, Aquaman and Cyborg will also join the band.
And speaking of obvious, Superman is also guaranteed to return from the dead, a feat that isn't all that difficult when you happen to be the Last Son of Krypton.
Beyond this basic outline, however, little else has been revealed about the specifics story. There are bound to be a few surprise in store and those well versed in their DC lore will have an idea or two of what they could be...