Marvin is an ordinary boy who loves spending time with Grandpa, reading comics and doing science experiments with his best friend Joe. But everything changes when he discovers a mysterious superhero suit hidden in the attic . . . to his amazement, Marvin learns that he is next in a long line of superheroes. Now the time has come to meet his destiny!

When the Science Fair is thrown into chaos by super-villain Mastermind and her giant robot, Marvin is the only one who can stop them. Will Marvin be brave enough to step into his power-and into his superhero suit-to become the great and marvellous superhero Marv?