Ultimate Alliance (Marvel Fanfiction)

When the World's Mightiest Villains unite to take down the Mightiest Heroes of the Universe, the Avengers, Fantastic Four, Guardians of the Galaxy, The Defenders, Web Warriors, and the X-Men must form an Ultimate Alliance to counter this global threat.

I don't own any of the pictures or characters in this story. All credits go to Marvel, who owns these.