Lunella Lafayette is one of the most brilliant minds in the Marvel-Verse - and she's only a fourth-grader! Moon Girl has brawn to back up her brains too - in the form of her big red T.Rex, Devil Dinosaur! Together, they're making a huge impression on the world! It's a rite of passage for any young hero to share a team-up with Spider-Man - but can Lunella, Devil and Spidey withstand the menace of the Pink Goblin? And as the War of the Realms rages around them, get ready for an epic battle: dinosaur vs. Frost Giant! But just who is the smartest one there is: Moon Girl or Mister Fantastic? Marvel's main geniuses are about to be put to the test!