Premiere. The superhero team faces a threat from within when Iron Man creates an artificial intelligence to take their place protecting the world. The android grows resentful of his creators, and decides his mission is best accomplished by wiping out the human race. Meanwhile, a pair of vengeful superpowered twins seeks to turn the Avengers against each other. Sci-fi adventure sequel, starring Robert Downey Jr, Chris Hemsworth, Chris Evans and Scarlett Johansson.