Mr. Men Adventure with Superheroes (Mr. Men and Little Miss Adventures) -- Paperback / softback

Mr Strong has become a superhero with his own secret hideout and gadgets galore, but what every good superhero needs is a sidekick. So Mr Strong asks his friends if they'd like to try out. But he soon realises that choosing a sidekick is hard work. Which Mr Men or Little Miss will have what it takes to make the perfect superhero sidekick?