The Avengers (2012), Avengers: Age of Ultron (2015)
Doctor Bruce Banner (also known as the Hulk) is physicist specializing in gamma rays. A failed experiment exposed him to such a large amount of gamma rays that is altered his body transforming him into the Hulk. The Hulk has near-limitless physical strength depending directly on his emotional state, particularly his anger.
Thor: Ragnarok (2017)
The Hulk wearing Gladiator Armor – Hulk decided to leave Earth after the events of Ultron and remain in the Hulk form and becomes a gladiator on a far off planet.
He has since learned to speak, to the level of a 2-3 year old child.
Avengers: Infinity War (2018)