During an average morning of heroic deeds, Spider-Man is interrupted by the Fantastic Four and Namor with distressing news: the great underwater city of Atlantis has disappeared, and the heroes need Spider-Man's help to find it! Spider-Man takes on the uncertain mission hoping not to disappoint the heroes . . . But when other super heroes start going missing around the city, Spidey realizes he might need more than just super-powers to save the day.