Starro and the Cyberspore

When school children start changing into zombies, Batman, Superman, Aquaman and the rest of the Justice League leap into action. They soon discover that Starro the Conqueror is bent on world domination with the help of a mobile phone app. Can the Justice League stop the alien starfish before it's too late? Or will Starro's sinister cyberspore lead to a worldwide zombie apocalypse?