Think encyclopedias are boring? Not this one—every large page is packed with exciting images from the world of Marvel's Avengers, captioned with loads of information about their seemingly infinite universe of worlds and superheroes like Captain America and Black Widow. When these guys team up, the action gets huge, and here you can explore the origins and powers of more than 250 characters and 40 alliances, including the genesis of the original Avengers team and its individual heroes and foes. Here too are twenty of the most significant storylines, and special features like a lineup of Iron Man's many suits and all the characters who have wielded Thor's hammer.