Avengers: Age of Ultron (2015)

Avengers: Age of Ultron follows directly the events of Captain America: The Winter Soldier. After SHIELD is dissolved, the Avengers are searching for the stolen Scepter of Loki. When finding it, they face the twins Quicksilver and Scarlet Witch and find themselves overwhelmed by just two kids.

Tony Stark uses the scepter without letting his fellow teammates know and creates Ultron, a powerful AI who wants to destroy the world. All the Avengers are present in the final confrontation, which takes place in Sokovia. The final epic battel sees the death of Quicksilver, Scarlet Witch switching sides and fighting alongside the Avengers, as well as the introduction of Vision, another powerful android, powered by an Infinity Stone.

The movie also introduces Ulysses Klaue, thus hinting at the appearance of another superhero in the Marvel Cinematic Universe, namely Black Panther.

Avengers: Age of Ultron also leads directly into Captain America: Civil War, while also setting the stage for Thor: Ragnarok. Thor’s vision shows him that somebody is seeking to unite the Infinity Stones.

After clashing with Steve Rogers, Tony Stark leaves the team – it is fairly obvious that these two are meant to fight during the Marvel Cinematic Universe’s Civil War.