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! Mega Packs let you jumpstart your collection with six characters: four starting Heroes [including an exclusive Loki (Frost Giant) variant] and two more trapped in Thanostones!