: After earning the Dark Knight's trust, Maxwell and Lily learn that a villain matching Maxwell's description is helping the Joker. This villain is Doppelganger, Maxwell's evil twin creation from a previous adventure.

: By outsmarting the villains with creative notebook summons, Maxwell recovers all the Starites, repairs Lily's globe, and sends Doppelganger back to his own world before the siblings return safely home.

: The combination works too well, and the pair are sucked directly into the DC Comics universe. Upon arrival, Lily's magical globe shatters, scattering its powerful energy sources—known as Starites—across the universe.

: Both are massive fans of DC Comics but cannot agree on which of their favorite superheroes would win in a fight.

: To settle the debate, Maxwell writes "Gotham City" in his magical, object-manifesting notebook and combines it with Lily's teleportation globe.

: Maxwell and Lily must team up with Batman, Superman, and the rest of the Justice League . They travel through iconic locations like Metropolis and Atlantis to solve puzzles and collect the missing Starites.

: Maxwell's imagination is pushed to its absolute limits when he is forced to battle Brainiac. Brainiac has united the DC supervillains and cloned Maxwell's doppelganger to rewrite the rules of the universe.