When Tony Stark and Bruce Banner try to jump-start a dormant peacekeeping program called Ultron, things go horribly wrong and it's up to Earth's mightiest heroes to stop the villainous Ultron from enacting his terrible plan.
Tony Stark creates the Ultron Program to protect the world, but when the peacekeeping program becomes hostile, The Avengers go into action to try and defeat a virtually impossible enemy together.
Earth's mightiest heroes must come together once again to protect the world from global extinction.