The Marvel Saga the Official History of the Marvel Universe #10

This 1986 installment of Marvel's ambitious reprint-and-annotation series packs an extraordinary amount of Marvel history into one issue, and the cover by Keith Pollard and Al Williamson makes that ambition immediately vivid. Professor X sits in his wheelchair at center, surrounded by the original X-Men — Cyclops, Iceman, Angel, Beast, and Marvel Girl (shown in inset) — while below them the founding Avengers, including Thor, the Hulk, Iron Man, and Ant-Man, clash in their first battle. Promising the origins of the X-Men, the Avengers, the Beast, Marvel Girl, and Doctor Strange all under one cover, "Book X: To Stand United!" offers a remarkably generous deep-dive into the early Marvel Universe.