Superhero sequel. The Avengers reassemble to face their toughest ever challenge in the form of a rogue Stark Industries invention. Intent on retiring from his life as Iron Man, Tony Stark secretly begins work on a robot strike force capable of keeping the peace. When his AI experiment goes badly wrong, however, he must call on the help of Captain America, Thor, the Hulk, Black Widow and Hawkeye once again - but will the collective might of the Avengers be enough to take down the seemingly unstoppable Ultron? Show less