The Marvel Comics superhero team assembles in this ambitious blockbuster from writer/director Joss Whedon. Iron Man (Robert Downey, Jr.), Captain America (Chris Evans), Thor (Chris Hemsworth), Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), and the Hulk (a motion-captured Mark Ruffalo) must combine their strength to stop the evil Loki (Tom Hiddleston) and his alien army from conquering Earth.