Possible Villain Revealed for 'Justice League: Part One'
With the 'part one' moniker attached to its name, it was always a good chance Darkseid would play the role that's been teased in Batman v Superman, but that the villain wouldn't make his monstrous mark on the universe until part two.
In a deleted scene released a few weeks back, a demonic form of some kind appeared to Lex Luthor. BirthMoviesDeath's Devin Faraci is reporting that the villain of Justice League is Steppenwolf, a lieutenant of Darkseid's. In the film, according to Faraci, Steppenwolf will have a contentious relationship with the latter.
Darkseid may not appear until the end of the film in order to set up his role beyond that point. In the comics, Steppenwolf is Darkseid's uncle, and leads the military of their homeworld Apokolips.
You can see the deleted scene here.
Source: Comicbook