Loki, a new and dire threat emerges as he manipulates the unstable and immensely powerful Sentry, unleashing a sinister plan to bring Thanos' formidable army to Earth. With the fate of the world hanging in the balance, Nick Fury, the director of S.H.I.E.L.D., must assemble a team of Earth's mightiest heroes, the Avengers, to thwart Loki's malevolent scheme and prevent the impending invasion.