Title says everything. Mysterio accidentally discover a super lexicon and solves it. He then summons The Cenobites oversees by The Leaviathan on Earth. Before Mysterio is dragged to hell, he tells Pinehead about a legion of humans that never suffered pain or feared it. Pinehead get's interested and decides to spare Mysterio for some time while his Cenobite army goes after this hero.
Every Marvel Earth hero so far. Franklin Richards is only a teenager here, otherwise he would stomp.