Exploding out of the Marvel Universe are its greatest heroes and most notorious villains! A savage, mutating Scorpion tears through New York City, and not even Spider-Man can stop him! But help soon arrives in the form of the rock-skinned Thing, and the two squash the Scorpion. To reverse his mutation, the Thing takes the Scorpion to the X-Men, where he is met by the Beast (who will do his best to cure the villain) and Wolverine, who will make sure he doesn't get out of line!