Karen Gillan, Bradley Cooper, Brie Larson, Scarlett Johansson, Evangeline Lilly, Robert Downey Jr., Chris Evans, Josh Brolin, Paul Rudd, Elizabeth Olsen more return for 'Avengers: Endgame'. In the aftermath of Thanos wiping out half of all life in the universe, the Avengers must do what's necessary to undo the Mad Titan's deed. This first trailer is in HD.