Pick your favorite hero, rescue your friends, and win battles to defeat Thanos! Battleworld is a revolutionary cooperative, expandable, collectible adventure game featuring dozens of characters from all over the Marvel Universe! Players get to crack open the mysterious Thanostones during the course of play to reveal the mystery character inside for a constant sense of surprise and delight! The Battle Ball provides fully-playable introduction to Battleworld in a collectible size! The Mega Pack jumpstarts your collection into Battleworld! Each pack includes: 13 battle cards, 6 characters; 4 starting Heroes (including an exclusive Negative Zone Spider-Man variant) with two more trapped in Thanostones, and 6 hero stands for everything you need to play!