Avengers: Endgame is a 2019 superhero film and the epic conclusion to the Marvel Cinematic Universe's Infinity Saga. Robert Downey Jr. reprises his role as Tony Stark/Iron Man, who plays a pivotal role in the battle against the powerful villain Thanos. The film showcases Downey Jr.'s emotional and impactful performance as Iron Man, providing a satisfying conclusion to his character's arc. Avengers: Endgame is a must-watch for fans of the Marvel Cinematic Universe and superhero movies in general.