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.