To fully understand the character's arc, viewers often include major "Avengers" crossover events in their watchlist: The Avengers (2012) : Cap joins the team to stop Loki's invasion. Avengers: Age of Ultron (2015) : The team battles the artificial intelligence Ultron. Avengers: Infinity War (2018) : Cap leads the defense of Wakanda against Thanos. Avengers: Endgame (2019)