Agent 13: The Midnight Avenger

Although stated as being their past, the Fantastic Four have actually visited the alternate reality of Earth-49487. It was indexed in Official Handbook of the Marvel Universe A-Z #3. Analogous with the early days of Earth-616 history, the placement of this story can be attributed as happening prior to Fantastic Four #22 and Avengers #3. This can be ascertained by the following facts: The Avengers featured here do not have the Hulk (who quit in Avengers #2) or Captain America (who joined in Avengers #4) among their ranks. Since Henry Pym is Giant-Man and Iron Man is still wearing his original armor this places these events before Avengers #3. The Invisible Girl cannot create invisible force fields in this story, as skill that Sue didn't master until Fantastic Four #22. This comic features a tribute to Jack Kirby, who died on February 6, 1994. https://marvel.wikia.com/wiki/Fantastic_Four_Vol_1_388
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