What if the third Justice League Movie is like
Avengers Infinity War/Endgame.
The Heroes and Villians of Earth are fighting Darkseid's Army of New Gods and Parademons and also Grail,Darkseid's biological daughter.
Just like the final episode of Justice League Unlimited and Justice League:Darkseid War.
Characters
Justice League
Suicide Squad
Legion of Doom
Amazons
Altanteans
Green Lantern Corps
Air Force
Army
Highfather
New Gods of New Genesis
Vs
Darkseid
Grail
Dessad
Kailbak
Parademons
War Hounds
Apokilitian Troopers
Female Furies