When the Avengers assemble to defeat a horrible monster that appears in the skies over Brooklyn, they quickly learn that the creature was seemingly drawn there by a young woman with the ability to open portals to other realms. The mysterious woman escapes, but Tony Stark and the team track her down, only to find she is one of a team of unknown, super-powered individuals ... who are decidedly not interested in answering the Avengers' questions. As the battle rages, it becomes clear these young villains are not the ones controlling their powers.