Super Hero Squad: Aliens Attack! (Passport to Reading Level 1)

When villainous Dormammu opens a portal in the sky he unwittingly unleashes an attack by aliens. Villain or Super Hero--it doesn't matter what side you're on--these aliens are on a mission to take over the world. It's up to Iron Man, Thor, Captain America, and the Hulk and the other Squaddies to work together with the Villains to save Earth from alien invasion!