The scene after the credits of Justice League Beyond.
A minion walks to his master in a dark cave and kneels to him.
Minion: Master Jolk the brother of the one they call Warhawk was defeated, by the Justice League. Humans, if we attacked them they would defeat us, unlike we thought. But now, you can absorb any blood-thirsty monster in the universe.
The master( dark purple, only showing his face but with black shadows covering 75% percent of his face. He smiles.
Unknown Master: The Justice League do not know what's coming to them.
His head appears to have grey diodes, showing that he is Braniac.