In The Avengers: Age of Ultron Earth's Mightiest must reunite and work with newcomers Quicksilver and Scarlet Witch to battle new antagonist Ultron, who receives an all-new origin story, while dealing with a new level of inner conflict amongst the team. Quicksilver & Scarlet Witch may not necessarily agree with The Avengers and Tony Stark may be responsible for the creation of the new villain.
Loki’s scepter fell into the wrong hands at the end of The Avengers and is being used to experiment on human beings. The Avengers raid a Hydra facility where they also encounter two powerful test subjects, Pietro and Wanda Maximoff, who believe Tony Stark caused the death of their parents. Iron Man (Robert Downey, Jr.) retrieves the scepter and secretly works with Bruce Banner (Mark Ruffalo) on the "Ultron" project to protect the world.
The project goes wrong, and Utron begins to believe the world should be eradicated. The two test subjects, Quicksilver (Aaron Taylor-Johnson) and Scarlet Witch (Elizabeth Olsen) are recruited to join him and in their next encounter with the Avengers, the latter worked her magic to induce hallucinations in the minds of the Avengers.
As Ulton transfers his consciousness in a new and better body, Scarlet Witch finds out about his plans to destroy Earth and stops the complete transfer. The Avengers retrieve the body, and Thor (Chris Hemsworth) brings it to life with lightning. The body becomes another being called Vision (Paul Bettany) and together they fight against Ultron and his army to save the world.
Avengers: Age of Ultron was directed and written by Joss Whedon and produced by Kevin Feige for Marvel Studios. The movie was released on April 13, 2015.
The Avengers were featured again in the 2016 movie Captain America: Civil War.
The upcoming sequel Avengers: Infinity War is scheduled to premiere on May 4, 2018.