What If?

What If...? is a comic book anthology series published by Marvel Comics starting in 1977. Each issue is a story, or collection of short stories, exploring how the Marvel Universe might have unfolded if key moments in its history had not occurred as they did in the comics where they were originally published.

Issue 1: "What If Spider-Man Had Joined the Fantastic Four?"
In the original Marvel story, Spider-Man attempted to join the Fantastic Four and was rebuffed. But in this story, Sue Storm makes an impassioned plea to give Spider-Man a chance on the team. As a result, the villainous Puppet Master decides he will need help in fighting the FF, and he controls the mind of Namor, the Sub-Mariner. Namor kidnaps Sue Storm using a hypno-fish, to draw out the remaining members of the FF.

Issue 10: "What If Jane Foster Had Found -- The Hammer of Thor?"
If Donald Blake was worthy to hold aloft the enchanted hammer Mjolnir and be transformed into the Mighty Thor, why wouldn't the same be true of his ever-loyal and good-hearted nurse, Jane Foster? In this story it is Foster, not Blake, who discovers Mjolnir as an enchanted stick, and when she touches it she is transformed into the thunder goddess Thordis. In the original story, the trickster god Loki hypnotized Thor in a successful attempt to get him to surrender Mjolnir; in this story, Loki hypnotizes Thordis in exactly the same way, but fails.