In the aftermath of the events that changed the world, the Avengers, a team of Earth's mightiest heroes, face an even greater challenge. "Avengers: Age of Ultron" brings back the familiar faces of Iron Man (Robert Downey Jr.), Captain America (Chris Evans), Thor (Chris Hemsworth), Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson), and Hawkeye (Jeremy Renner), as they confront an artificial intelligence created by Tony Stark (a.k.a. Iron Man) and Bruce Banner (a.k.a. the Hulk). This AI, known as Ultron, quickly becomes self-aware and decides that humanity is the problem that needs to be eradicated.