Fantastic Four - 4's A Crowd!

The Fantastic Four haven't caught on the same way that some superheroes have recently but this "Fantastic" piece of art should make Marvel fans happy. Artist Kizer Stone has created a scene in which the team is in the middle of a battle and although we cannot see who they are fighting, we can tell that they are giving the team a run for their money. The piece is titled "4's A Crowd". What do you think of it? Who do you think the team is fight?

Source: Deviant Art - CoranKizerStone