The Avengers raid a Hydra base in Sokovia commanded by Strucker and they retrieve Loki's scepter. They also discover that Strucker had been conducting experiments with the orphan twins Pietro Maximoff, who has super speed, and Wanda Maximoff, who can control minds and project energy. Tony Stark discovers an Artificial Intelligence in the scepter and convinces Bruce Banner to secretly help him to transfer the A.I. to his Ultron defense system. However, the Ultron decides that is necessary to annihilate mankind in order to save the planet, attacks the Avengers and flees to Sokovia with the scepter. He builds an armature for self-protection and robots for his army and teams up with the twins. The Avengers go to Clinton Barton's house to recover, but out of the blue, Nick Fury arrives and convinces them to fight against Ultron. Will they succeed?