When Thor's evil brother, Loki (Tom Hiddleston), gains access to the unlimited power of the energy cube called the Tesseract, Nick Fury (Samuel L. Jackson), director of SHIELD, initiates a superhero recruitment effort to defeat the unprecedented threat to Earth. Joining Fury's ``dream team'' are Iron Man (Robert Downey), Captain America (Chris Evans), the Hulk (Mark Ruffalo), Thor (Chris Hemsworth), Black Widow (Scarlett Johansson) and Hawkeye (Jeremy Renner) .