History
Quentin Beck presumably had a similar or identical early history to his Earth-616 counterpart; like his main self, Mysterio became an enemy of Spider-Man and fought him at least a few times. Spider-Man in his civilian identity of Peter Parker gave J. Jonah Jameson photos of at least one of their battles.[1]
What became of Mysterio is unknown, save that by 2019 he, along with all of Spider-Man's other enemies, was dead.[2]